ASP.NET Core .NET 8 receives null form values from certain iPhone 13 Pro Max devices

Question

Question

Answer 1

Nguyen Dam (WICLOUD CORPORATION) 1,335 Microsoft External Staff Moderator

Hello @Ibrahim Akuetiemhe and thank you for reaching out.

The behavior differs even between similar iPhone devices so I would suggest first determining whether the form values are already missing when ASP.NET Core parses the request, or whether they are present and only become null during model binding.

You can temporarily bypass the DTO with a diagnostic endpoint, for example:

[HttpPost("diagnose-upload")]
public async Task<IActionResult> DiagnoseUpload()
{
    var request = Request;

    if (!request.HasFormContentType)
    {
        return BadRequest(new
        {
            request.ContentType,
            request.ContentLength
        });
    }

    var form = await request.ReadFormAsync();

    return Ok(new
    {
        request.ContentType,
        request.ContentLength,
        FormValues = form.ToDictionary(
            item => item.Key,
            item => item.Value.ToArray()),
        Files = form.Files.Select(file => new
        {
            file.Name,
            file.FileName,
            file.ContentType,
            file.Length
        })
    });
}

Compare the result from a working device with the affected iPhone

Values are missing/incorrect in Request.Form -> the issue is before model binding. Compare the requests from both devices, including the form data, Content-Type, multipart boundary, files, and payload.
Values are correct in Request.Form but null in [FromForm] -> the issue is likely with model binding or the DTO. Check ModelState for binding errors.

If possible, please provide the JavaScript submission code, DTO, controller action, and the diagnostic results from both a working and affected device. These should help identify where the values are being lost.

Hopefully, this should help narrow down the root cause. If you found my response helpful or informative, I would greatly appreciate it if you could follow this guide for your confirmation. Thank you.

Nguyen Dam (WICLOUD CORPORATION) 1,335 Reputation points Microsoft External Staff Moderator

2026-10-30T04:26:52.0566667+00:00
Hello @Ibrahim Akuetiemhe ,

Thank you for sharing the additional results. The affected iPhone sends an empty request (contentLength: 0), so the values are being lost on the client side, before the request reaches ASP.NET Core.
I would suggest starting with the two tests already mentioned in another answer:

Send the form with only the text fields. Temporarily comment out the code that appends files. If the text fields arrive correctly, that would help narrow the issue down to the file uploads.

Read each file into memory before appending it.

For reference, you can use the following helper and adapt it to your existing upload code.

async function cloneFile(file) { const bytes = await file.arrayBuffer(); return new File([bytes], file.name, { type: file.type }); } // Inside an async function: const cloned = await cloneFile(idFile); formData.append("Identification", cloned);

Apply this to both the identification file and the cover files. If you make buildPolicyFormData() asynchronous, also update its caller. Make sure all file copies have finished before sending the request.

const formData = await buildPolicyFormData();

If arrayBuffer() throws, please share the error message. That would help determine whether reading the selected file is failing. If it succeeds, check whether uploading the cloned files changes the result.

Those would be the two main tests I suggest first. If they do not help narrow it down further, you could also:

Create a separate minimal FormData request, starting with a hard-coded text field. Then add other values and a small local file one at a time to see when the request becomes empty.

Check whether the application uses a service worker. If so, temporarily unregister it and test again.

Clear the website data on the affected iPhone and confirm that both devices are running the same JavaScript version.

Please let me know the results of the two main tests. If you need help with any of the additional checks, feel free to ask.
Ibrahim Akuetiemhe 0 Reputation points

2026-10-30T09:32:11.7+00:00

Still did not work. The request size of the iPhone is 0.5MB which is no way near the request body max size
Nguyen Dam (WICLOUD CORPORATION) 1,335 Reputation points Microsoft External Staff Moderator

2026-10-30T10:07:53.2866667+00:00

Hi @Ibrahim Akuetiemhe ,

From your mention of the 0.5 MB upload, I understand “still did not work” to refer to trying the earlier suggestion to increase the request-size limit. Please let me know if you meant a different test.

In any case, submitting without files and trying the in-memory file copies would also help narrow this down. If you have had a chance to try those two tests, could you share what happened with each?
Ibrahim Akuetiemhe 0 Reputation points

2026-10-30T15:14:46.4033333+00:00

Hello Microsoft Support Team,
I have made significant progress in reproducing the issue and have identified a consistent trigger.

Today's findings:

I have established that the problem is specifically triggered when an image is included in the form submission from the affected iPhone.

My observations are:

When I complete the form and submit it without selecting any image, all the form data reaches the ASP.NET Core backend correctly.

When I select an identification image, all the form fields become null at the backend.

The same behaviour occurs when I select a cover image.

Selecting both identification and cover images also produces the same result.

I also tested several image formats, including PNG, JPEG, HEIC and WebP. The behaviour remained the same across the formats tested: once an image is attached, the backend receives the form fields as null.

This makes it less likely that the issue is specific to a particular image format or codec.

Some optional fields, such as MiddleName and LandMark, are naturally empty. However, even populated and required fields become null when an image is attached.

This is particularly interesting because the issue does not occur when the same form is submitted without an image.

I believe this finding narrows the investigation to how multipart/form-data requests containing binary image files are handled on the affected iPhone/Safari environment.

I will continue investigating and share any additional findings.

Thank you.
Paul Thomas 160 Reputation points

2026-10-31T04:04:56.7533333+00:00
@Ibrahim Akuetiemhe Thanks, that's the key result. The text fields arrive without an image and all of them disappear with one, in every format. So Safari fails while reading the image file and then sends the whole body empty. Your server code is fine.

The next test is to read each image into memory yourself before adding it to the form. If Safari can't read the file, this throws an error you can see, instead of silently sending an empty request. Add this function:

async function toInMemoryFile(file) { console.log('file', file.name, file.type, file.size, file.lastModified); const buffer = await file.arrayBuffer(); // throws here if Safari can't read the file return new File([buffer], file.name || 'image.jpg', { type: file.type || 'application/octet-stream' }); }

Then, wherever you append a file, append the copy instead:

try { formData.append('IdentificationImage', await toInMemoryFile(idInput.files[0])); } catch (err) { alert('Could not read image: ' + err.name + ' - ' + err.message); return; }

On the affected iPhone, there are two possible results:

The upload now works. The original file reference was going stale between selection and submit (for example, the file input being re-rendered or reset). Keep the in-memory copy as the fix.

An error appears. Please post the exact err.name and message (for example NotReadableError) and the logged size and type. A size of 0 or a read error points to the photo picker on that device, and testing with a photo taken fresh with the camera vs. one from the library will show which.
Nguyen Dam (WICLOUD CORPORATION) 1,335 Reputation points Microsoft External Staff Moderator

2026-11-02T04:30:44.0366667+00:00

Hello @Ibrahim Akuetiemhe ,

That is a useful result. The issue now appears to be narrowed down to the file-upload behavior on Safari rather than ASP.NET Core model binding.

Unfortunately, my support is limited to Microsoft products, so I may not be able to provide the best guidance for an issue originating in Safari or WebKit.

Nevertheless, I found a closely related WebKit bug report whose reported behavior appears very similar to your findings:
https://bugs.webkit.org/show_bug.cgi?id=319985
[This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.]

For now, you could try the workaround that Paul and I previously suggested: reading each selected file with arrayBuffer() and appending the resulting in-memory File or Blob to FormData. If your issue is caused by the reported WebKit regression, a permanent fix would need to come through a Safari or iOS update containing the WebKit fix, although I cannot confirm which released update will include it.

If further investigation of the Safari-specific behavior is needed, I suggest continuing through Apple or WebKit support channels.

If the in-memory workaround succeeds, it would still be helpful if you could share the result here. You are also welcome to continue the discussion if you identify any further concerns involving ASP.NET Core or another Microsoft product.
Nguyen Dam (WICLOUD CORPORATION) 1,335 Reputation points Microsoft External Staff Moderator

2026-11-04T02:18:43.98+00:00

Hello @Ibrahim Akuetiemhe ,

Just following up to see whether you had a chance to try the in-memory file workaround mentioned above. I’d be interested to know whether it changed the behavior or made the upload work on the affected iPhone.

In case you have any further findings or questions related to the ASP.NET Core side, please feel free to share them here.
Ibrahim Akuetiemhe 0 Reputation points

2026-11-04T07:59:55.4966667+00:00

I have visited the site https://bugs.webkit.org/show_bug.cgi?id=319985 and it seems promising.
How ever, I lost my work computer two days ago and am yet pro replace it. am doing what I can to recover it first.
Thank God for Git and one drive, my code and document are safe.
I really appreciate you and your team effort and patience so far.
Nguyen Dam (WICLOUD CORPORATION) 1,335 Reputation points Microsoft External Staff Moderator

2026-11-04T08:34:49.89+00:00

Hi @Ibrahim Akuetiemhe

I am always happy to provide assistance if it can be of any help! Needless to say, please feel free to reach out.

If the information shared so far has been helpful, you may also consider following this guide to provide your confirmation, as this can help others who encounter a similar issue.
Nguyen Dam (WICLOUD CORPORATION) 1,335 Reputation points Microsoft External Staff Moderator

2026-11-06T02:30:54.0533333+00:00

Hi @Ibrahim Akuetiemhe ,

Just checking back in on this thread in case you have been able to resume the investigation, or have any further findings or results from trying the suggested workaround.

Otherwise, please take your time, and feel free to follow up whenever convenient.
Nguyen Dam (WICLOUD CORPORATION) 1,335 Reputation points Microsoft External Staff Moderator

2026-11-10T01:46:05.8+00:00

Hi @Ibrahim Akuetiemhe ,

Apologies for the repeated follow-ups. I just wanted to check back in case you've had a chance to resume investigating the issue or have any further findings from the suggested workaround.

I realize you may still have other priorities to attend to, so please take your time. You're always welcome to share any updates here whenever convenient. And if you encounter any separate issues involving ASP.NET Core or other Microsoft products, feel free to start a new thread on Microsoft Q&A.

Thank you, and I hope everything works out well for you.
Ibrahim Akuetiemhe 0 Reputation points

2026-11-12T06:15:34.42+00:00

Thank for the follow up. I will be replacing my laptop before the end of next week.

However, it seems it's working because the backend returned the payload as json serialise and the image information is included. You can test it too. demo.prudentchoice.com.ng

Answer 2

This is from a working device
{

"contentType": "multipart/form-data; boundary=----WebKitFormBoundaryPgoBscBBF4qYl6KM",

"contentLength": 111491,

"fields": {

    "FirstName": {

        "count": 1,

        "hasValue": true

    },

    "MiddleName": {

        "count": 1,

        "hasValue": true

    },

    "LastName": {

        "count": 1,

        "hasValue": true

    },

    "PhoneNumber": {

        "count": 1,

        "hasValue": true

    },

    "Sex": {

        "count": 1,

        "hasValue": true

    },

    "DOB": {

        "count": 1,

        "hasValue": true

    },

    "Agent": {

        "count": 1,

        "hasValue": true

    },

    "Address": {

        "count": 1,

        "hasValue": true

    },

    "EmailAddress": {

        "count": 1,

        "hasValue": true

    },

    "NOKFullName": {

        "count": 1,

        "hasValue": true

    },

    "NOKRelationship": {

        "count": 1,

        "hasValue": true

    },

    "NOKPhoneNumber": {

        "count": 1,

        "hasValue": true

    },

    "NOKAddress": {

        "count": 1,

        "hasValue": true

    },

    "IdentificationTypeId": {

        "count": 1,

        "hasValue": true

    },

    "IdentificationNumber": {

        "count": 1,

        "hasValue": true

    },

    "ExpiryDate": {

        "count": 1,

        "hasValue": false

    },

    "StateID": {

        "count": 1,

        "hasValue": false

    },

    "LGAID": {

        "count": 1,

        "hasValue": false

    },

    "StreetNumber": {

        "count": 1,

        "hasValue": false

    },

    "StreetName": {

        "count": 1,

        "hasValue": false

    },

    "LandMark": {

        "count": 1,

        "hasValue": false

    },

    "PolicyID": {

        "count": 1,

        "hasValue": true

    },

    "Covers[0].CoverID": {

        "count": 1,

        "hasValue": true

    },

    "CoverFiles[0].CoverId": {

        "count": 1,

        "hasValue": true

    },

    "CoverFiles[0].Label": {

        "count": 1,

        "hasValue": true

    },

    "CoverFiles[0].coverUploadRequirementID": {

        "count": 1,

        "hasValue": true

    }

},

"files": [

    {

        "name": "Identification",

        "fileName": "NIA.png",

        "contentType": "image/png",

        "length": 54168

    },

    {

        "name": "CoverFiles[0].File",

        "fileName": "NIA.png",

        "contentType": "image/png",

        "length": 54168

    }

],

"totalFields": 26,

"totalFiles": 2

}

And this is from the iPhone
{

"contentType": "multipart/form-data; boundary=----WebKitFormBoundaryqXbmvYh367BCwgcB",

"contentLength": 0,

"fields": 0,

"files": 0,

"totalFields": 0,

"totalFiles": 0

}

Answer 3

These are my code samples

**Controller
** public async Task<IActionResult> Get([FromForm] BuyInsuranceDTO b)

{

    //if (!User.HasClaim("Permission", Permissions.PurchasePolicy))

    //{

    //    return StatusCode(403, new

    //    {

    //        success = false,

    //        message = "Sorry, you cant purchase policy at the moment."

    //    });

    //}



    var loggedInCustomer = Convert.ToInt16(User.FindFirst(ClaimTypes.NameIdentifier)?.Value);

    var upload = Request.Form.Files.Where(x => x.Name == "Identification").FirstOrDefault();

    var createPolicy = await service.CreateService(b, upload, loggedInCustomer, User.Identity.IsAuthenticated);

    if (!createPolicy.Success)

    {

        return Json(new MyResponse { Success = false, Message = createPolicy.Message });

    }

    return Json(new MyResponse { Success = true, Message = createPolicy.Message });

}**

DTO
public class BuyInsuranceDTO**

**{**

    **// ================= BASIC =================**

    **[Required]**

    **public string FirstName { get; set; }**

    **[Required]**

    **public string LastName { get; set; }**

    **public string MiddleName { get; set; }**

    **[Required]**

    **[Range(1, 2)]**

    **public int Sex { get; set; }**

    **[Required]**

    **public DateTime DOB { get; set; }**

    **[Required]**

    **public string PhoneNumber { get; set; }**

    **[Required]**

    **public string Address { get; set; }**

    **public string EmailAddress { get; set; }**

    **public string Agent { get; set; }**

    **// ================= NEXT OF KIN =================**

    **[Required]**

    **public string NOKFullName { get; set; }**

    **public int NOKRelationship { get; set; }**

    **[Required]**

    **public string NOKPhoneNumber { get; set; }**

    **[Required]**

    **public string NOKAddress { get; set; }**

    **// ================= POLICY =================**

    **public Guid? PolicyID { get; set; }**

    **[Required]**

    **public List<CoverItemDTO> Covers { get; set; }**

    **// ================= IDENTIFICATION =================**

    **[Required]**

    **public int IdentificationTypeId { get; set; }**

    **[Required]**

    **public string IdentificationNumber { get; set; }**

    **public DateTime? ExpiryDate { get; set; }**

    **public IFormFile Identification { get; set; }**

    **// ================= BUSSINESS ADDRESS =================**

    **public string StreetNumber { get; set; }**

    **[Required]**

    **public string StreetName { get; set; }**

    **public string LandMark { get; set; }**

    **[Required]**

    **public int StateID { get; set; }**

    **[Required]**

    **public int LGAID { get; set; }**

    **[Required]**

    **public int AccountID { get; set; }**

    **// ================= COVER UPLOADS =================**

    **public List<CoverFileUploadDTO> CoverFiles { get; set; }**

    **//============ Declared Items=================**

    **public List<DeclarationItemsDTO> DeclarationItems { get; set; }**

**}**

Java Script
async function handleFinalSubmission() {

**if (!confirm('Are you sure you want to submit this policy application?')) {**

    **return;**

**}**

**const formData = buildPolicyFormData();**

**const result = await sendPolicy(formData);**

**if (!result) {**

    **return;**

**}**

**alert(result.message);**

**if (result.success) {**

    **window.location.href =**

        **'/policylisting/insuranceproduct';**

**}**

}

async function sendPolicy(formData) {

**if (isSubmitting) return;**

**isSubmitting = true;**

**showLoader();**

**try {**

    **const res = await fetch(`/policyListing/get`, {**

        **method: 'POST',**

        **body: formData**

    **});**

    **const data = await res.json();**

    **return data;**

**} catch (err) {**

    **console.error(err);**

    **alert("Failed to submit policy");**

    **return null;**

**} finally {**

    **isSubmitting = false;**

    **hideLoader();**

**}**

}

function appendIfExists(formData, key, elementId) {

const el = document.getElementById(elementId);

if (el)

    formData.append(key, el.value.trim());

}

function buildPolicyFormData() {

const formData = new FormData();

appendIfExists(formData, "FirstName", "firstName");

appendIfExists(formData, "MiddleName", "middleName");

appendIfExists(formData, "LastName", "lastName");

appendIfExists(formData, "PhoneNumber", "phone");

appendIfExists(formData, "Sex", "sex");

appendIfExists(formData, "DOB", "dob");

appendIfExists(formData, "Agent", "agent");

appendIfExists(formData, "Address", "address");

appendIfExists(formData, "EmailAddress", "email");

appendIfExists(formData, "NOKFullName", "nokName");

appendIfExists(formData, "NOKRelationship", "nokRelationship");

appendIfExists(formData, "NOKPhoneNumber", "nokPhone");

appendIfExists(formData, "NOKAddress", "nokAddress");

appendIfExists(formData, "IdentificationTypeId", "idType");

appendIfExists(formData, "IdentificationNumber", "idNumber");

appendIfExists(formData, "ExpiryDate", "expiryDate");

appendIfExists(formData, "StateID", "businessState");

appendIfExists(formData, "LGAID", "businessLga");

appendIfExists(formData, "StreetNumber", "businessStreetNumber");

appendIfExists(formData, "StreetName", "businessAddress");

appendIfExists(formData, "LandMark", "businessLandmark");

const idFile = document.getElementById('idUpload')?.files[0];

if (idFile) formData.append("Identification", idFile);

if (policyId) {

    formData.append("PolicyID", policyId);

}

// Covers

if (isCustomPolicy && selectedCovers.length > 0) {

    selectedCovers.forEach((cover, i) => {

        formData.append(`Covers[${i}].CoverID`, cover.CoverID);

        formData.append(`Covers[${i}].RiskCovered`, coverRisks[cover.CoverID] || 0);

    });

} else if (selectedCoverIds.length > 0) {

    selectedCoverIds.forEach((id, i) => {

        formData.append(`Covers[${i}].CoverID`, id);

    });

}

// Dynamic Cover Files

let fileIndex = 0;

let itemIndex = 0;

document.querySelectorAll('.cover-upload').forEach(input => {

    const file = input.files[0];

    if (file) {

        formData.append(`CoverFiles[${fileIndex}].File`, file);

        formData.append(`CoverFiles[${fileIndex}].CoverId`, input.dataset.coverid);

        formData.append(`CoverFiles[${fileIndex}].Label`, input.dataset.label);

        formData.append(`CoverFiles[${fileIndex}].coverUploadRequirementID`, input.name);

        fileIndex++;

    }

});

// Declaration Items

document.querySelectorAll("#tblDeclarationItems tbody tr").forEach(row => {

    const itemName = row.querySelector(".item-name")?.value.trim();

    const amount = row.querySelector(".item-amount")?.value;

    // Ignore empty rows

    if (!itemName || !amount)

        return;

    formData.append(`DeclarationItems[${itemIndex}].ItemName`, itemName);

    formData.append(`DeclarationItems[${itemIndex}].Amount`, amount);

    itemIndex++;

});

return formData;

}

Answer 4

Paul Thomas 160

One likely cause that fits "only some iPhones" is the request body size limit. By default, ASP.NET Core rejects request bodies larger than 30,000,000 bytes (about 28.6 MB), and IIS and IIS Express have the same default limit. Photos from newer iPhones can push a multipart request over that, especially ProRAW images or several photos in one form, so one iPhone 13 Pro Max can work while another, with different photos or camera settings, fails.

What makes this confusing is that, on a controller without [ApiController], a body that's too large doesn't produce an obvious error: the form can't be read, so the [FromForm] model comes through as null.

What I tested (.NET 9, Kestrel, same defaults as .NET 8)

I posted a multipart form with two text fields and one file to a [FromForm] DTO:

RequestController without [ApiController]Controller with [ApiController]5 MB fileAll values arriveAll values arrive5 MB fileAll values arriveAll values arrive35 MB fileThe whole [FromForm] model is null400: "Failed to read the request form. Request body too large. The max request body size is 30000000 bytes."1. Check whether this is your problem

In the JavaScript, log the size of what you're sending, just before fetch, on a failing and a working device:

const totalBytes = [...formData.values()]
    .reduce((sum, value) => sum + (value instanceof File ? value.size : 0), 0);
console.log(`Upload size: ${(totalBytes / 1_000_000).toFixed(1)} MB`);

On the server, stop the failure from being silent. Check the model and ModelState at the start of the action, and the error message tells you directly:

if (form is null || !ModelState.IsValid)
{
    var errors = ModelState.Values.SelectMany(v => v.Errors).Select(e => e.ErrorMessage);
    return BadRequest(errors); // e.g. "Request body too large. The max request body size is 30000000 bytes."
}

2. If that's it, raise the limit for this action

[HttpPost]
[RequestSizeLimit(100_000_000)] // 100 MB for this action only
public IActionResult Submit([FromForm] CustomerForm form) { ... }

In my test, the 35 MB request bound correctly with this attribute. If a single upload can exceed 128 MB, also add [RequestFormLimits(MultipartBodyLengthLimit = ...)].

When the app is hosted in IIS (which SmarterASP uses) or run under IIS Express, IIS request filtering has its own limit, so raise it in web.config as well:

<system.webServer>
  <security>
    <requestFiltering>
      <requestLimits maxAllowedContentLength="104857600" />
    </requestFiltering>
  </security>
</system.webServer>

Pick the smallest limit that covers your real uploads. Resizing or compressing photos in the browser before upload is often a better fix than accepting very large requests.

If the logged sizes on the failing iPhones are well under 28 MB, it's something else, and Nguyen's diagnostic endpoint, comparing Request.Form on both devices, is the right next step.

Let me know what sizes you see. If this solves it, please consider marking it as the accepted answer so others with the same problem can find it.

Paul Thomas 160 Reputation points

2026-10-29T12:47:50.5+00:00
@Ibrahim Akuetiemhe
Thanks for posting the diagnostics. They rule out the size limit I suggested: the affected iPhone sends a valid multipart Content-Type with a boundary, but contentLength is 0 with no fields or files. So the browser is sending an empty body, before ASP.NET Core does anything. Your server code and the fetch call look fine. You let the browser set the Content-Type, which is correct.

Since the text fields go missing too, not just the files, my guess is that Safari fails to read one of the attached files and ends up sending nothing. I can't reproduce this on iOS 27, so here are some quick tests on the affected iPhone to narrow it down:

Test 1. Submit the form with no files attached. If the text fields then arrive, the attached file is the trigger.

Test 2. Log what's in the FormData right before fetch:

for (const [key, value] of formData.entries()) { console.log(key, value instanceof File ? `${value.name} ${value.type} ${value.size} bytes` : value); }

Look for a file with 0 bytes, an unexpected type such as image/heic, or one picked from iCloud Photos (with "Optimize iPhone Storage" enabled, the full photo may not be on the device).

Test 3. Read each file into memory before sending. If Safari can't read a file, this fails with a visible error instead of an empty request:

async function toInMemoryFile(file) { const bytes = await file.arrayBuffer(); // throws if the file can't be read return new File([bytes], file.name, { type: file.type || "application/octet-stream" }); } // in buildPolicyFormData (make it async): const idFile = document.getElementById('idUpload')?.files[0]; if (idFile) formData.append("Identification", await toInMemoryFile(idFile));

If it doesn't throw, the in-memory copy may also fix the upload.

To see the exact request, connect the iPhone to a Mac and use Safari → Develop → [your iPhone] (Web Inspector). The Network tab shows the request body Safari sends.
Ibrahim Akuetiemhe 0 Reputation points

2026-10-29T13:35:56.2866667+00:00
the total upload size is 0.5MB while this code
if (b is null || !ModelState.IsValid)

{

var errors = ModelState.Values.SelectMany(v => v.Errors).Select(e => e.ErrorMessage); return BadRequest(errors); // e.g. "Request body too large. The max request body size is 30000000 bytes."

}

producess the response from the attached image
Paul Thomas 160 Reputation points

2026-10-29T18:11:45.5933333+00:00
@Ibrahim Akuetiemhe Thanks, that screenshot confirms it. 0.5 MB rules out a size limit, and every field fails validation: FirstName, LastName, EmailAddress, PhoneNumber, Covers, CoverFiles, and so on. "Sex must be between 1 and 2" means Sex stayed at its default of 0. So nothing was bound at all, which matches the contentLength: 0 you logged. Safari sends an empty body, and model binding has nothing to bind. The server side is working correctly.

The quickest way to narrow it down is still on the affected iPhone:

Test 1: submit with no files attached. Do the text fields arrive?

Test 3: wrap each file with toInMemoryFile() before appending it. Does it throw, or does the upload start working?

Those two results will show whether one of the selected files is what makes Safari drop the whole body.
Ibrahim Akuetiemhe 0 Reputation points

2026-11-12T06:16:35.5533333+00:00

Thank for the follow up. I will be replacing my laptop before the end of next week.

However, it seems it's working because the backend returned the payload as json serialise and the image information is included. You can test it too. demo.prudentchoice.com.ng
Paul Thomas 160 Reputation points

2026-11-12T07:11:01.48+00:00

@Ibrahim Akuetiemhe Great to hear it's working, thanks for testing it. Once you've confirmed it on the new laptop as well, please mark the answer as accepted so others who hit the same iPhone issue can find it.

Answer 5

These are my code samples

**Controller
** public async Task<IActionResult> Get([FromForm] BuyInsuranceDTO b)

{

    //if (!User.HasClaim("Permission", Permissions.PurchasePolicy))

    //{

    //    return StatusCode(403, new

    //    {

    //        success = false,

    //        message = "Sorry, you cant purchase policy at the moment."

    //    });

    //}



    var loggedInCustomer = Convert.ToInt16(User.FindFirst(ClaimTypes.NameIdentifier)?.Value);

    var upload = Request.Form.Files.Where(x => x.Name == "Identification").FirstOrDefault();

    var createPolicy = await service.CreateService(b, upload, loggedInCustomer, User.Identity.IsAuthenticated);

    if (!createPolicy.Success)

    {

        return Json(new MyResponse { Success = false, Message = createPolicy.Message });

    }

    return Json(new MyResponse { Success = true, Message = createPolicy.Message });

}**  
```DTO  
**    public class BuyInsuranceDTO

```powershell
{

    // ================= BASIC =================

    [Required]

    public string FirstName { get; set; }

    [Required]

    public string LastName { get; set; }

    public string MiddleName { get; set; }

    [Required]

    [Range(1, 2)]

    public int Sex { get; set; }

    [Required]

    public DateTime DOB { get; set; }

    [Required]

    public string PhoneNumber { get; set; }

    [Required]

    public string Address { get; set; }

    public string EmailAddress { get; set; }

    public string Agent { get; set; }

    // ================= NEXT OF KIN =================

    [Required]

    public string NOKFullName { get; set; }

    public int NOKRelationship { get; set; }

    [Required]

    public string NOKPhoneNumber { get; set; }

    [Required]

    public string NOKAddress { get; set; }

    // ================= POLICY =================

    public Guid? PolicyID { get; set; }

    [Required]

    public List<CoverItemDTO> Covers { get; set; }

    // ================= IDENTIFICATION =================

    [Required]

    public int IdentificationTypeId { get; set; }

    [Required]

    public string IdentificationNumber { get; set; }

    public DateTime? ExpiryDate { get; set; }

    public IFormFile Identification { get; set; }

    // ================= BUSSINESS ADDRESS =================

    public string StreetNumber { get; set; }

    [Required]

    public string StreetName { get; set; }

    public string LandMark { get; set; }

    [Required]

    public int StateID { get; set; }

    [Required]

    public int LGAID { get; set; }

    [Required]

    public int AccountID { get; set; }

    // ================= COVER UPLOADS =================

    public List<CoverFileUploadDTO> CoverFiles { get; set; }

    //============ Declared Items=================

    public List<DeclarationItemsDTO> DeclarationItems { get; set; }

}
```**Java Script  
**async function handleFinalSubmission() {

```javascript
if (!confirm('Are you sure you want to submit this policy application?')) {

    return;

}

const formData = buildPolicyFormData();

const result = await sendPolicy(formData);

if (!result) {

    return;

}

alert(result.message);

if (result.success) {

    window.location.href =

        '/policylisting/insuranceproduct';

}
```}

async function sendPolicy(formData) {

```typescript
if (isSubmitting) return;

isSubmitting = true;

showLoader();

try {

    const res = await fetch(`/policyListing/get`, {

        method: 'POST',

        body: formData

    });

    const data = await res.json();

    return data;

} catch (err) {

    console.error(err);

    alert("Failed to submit policy");

    return null;

} finally {

    isSubmitting = false;

    hideLoader();

}
```}

  
function appendIfExists(formData, key, elementId) {

```sql
const el = document.getElementById(elementId);

if (el)

    formData.append(key, el.value.trim());
```}

function buildPolicyFormData() {

```javascript
const formData = new FormData();

appendIfExists(formData, "FirstName", "firstName");

appendIfExists(formData, "MiddleName", "middleName");

appendIfExists(formData, "LastName", "lastName");

appendIfExists(formData, "PhoneNumber", "phone");

appendIfExists(formData, "Sex", "sex");

appendIfExists(formData, "DOB", "dob");

appendIfExists(formData, "Agent", "agent");

appendIfExists(formData, "Address", "address");

appendIfExists(formData, "EmailAddress", "email");

appendIfExists(formData, "NOKFullName", "nokName");

appendIfExists(formData, "NOKRelationship", "nokRelationship");

appendIfExists(formData, "NOKPhoneNumber", "nokPhone");

appendIfExists(formData, "NOKAddress", "nokAddress");

appendIfExists(formData, "IdentificationTypeId", "idType");

appendIfExists(formData, "IdentificationNumber", "idNumber");

appendIfExists(formData, "ExpiryDate", "expiryDate");

appendIfExists(formData, "StateID", "businessState");

appendIfExists(formData, "LGAID", "businessLga");

appendIfExists(formData, "StreetNumber", "businessStreetNumber");

appendIfExists(formData, "StreetName", "businessAddress");

appendIfExists(formData, "LandMark", "businessLandmark");

const idFile = document.getElementById('idUpload')?.files[0];

if (idFile) formData.append("Identification", idFile);

if (policyId) {

    formData.append("PolicyID", policyId);

}

// Covers

if (isCustomPolicy && selectedCovers.length > 0) {

    selectedCovers.forEach((cover, i) => {

        formData.append(`Covers[${i}].CoverID`, cover.CoverID);

        formData.append(`Covers[${i}].RiskCovered`, coverRisks[cover.CoverID] || 0);

    });

} else if (selectedCoverIds.length > 0) {

    selectedCoverIds.forEach((id, i) => {

        formData.append(`Covers[${i}].CoverID`, id);

    });

}

// Dynamic Cover Files

let fileIndex = 0;

let itemIndex = 0;

document.querySelectorAll('.cover-upload').forEach(input => {

    const file = input.files[0];

    if (file) {

        formData.append(`CoverFiles[${fileIndex}].File`, file);

        formData.append(`CoverFiles[${fileIndex}].CoverId`, input.dataset.coverid);

        formData.append(`CoverFiles[${fileIndex}].Label`, input.dataset.label);

        formData.append(`CoverFiles[${fileIndex}].coverUploadRequirementID`, input.name);

        fileIndex++;

    }

});

// Declaration Items

document.querySelectorAll("#tblDeclarationItems tbody tr").forEach(row => {

    const itemName = row.querySelector(".item-name")?.value.trim();

    const amount = row.querySelector(".item-amount")?.value;

    // Ignore empty rows

    if (!itemName || !amount)

        return;

    formData.append(`DeclarationItems[${itemIndex}].ItemName`, itemName);

    formData.append(`DeclarationItems[${itemIndex}].Amount`, amount);

    itemIndex++;

});

return formData;
```}

paul levey 0 Reputation points

2026-11-02T05:46:48.77+00:00

******@paullevey.net

ASP.NET Core .NET 8 receives null form values from certain iPhone 13 Pro Max devices

Application details

Problem

Troubleshooting performed

Technical environment

Question

6 answers

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