How to add multiple attachments to an email using the "Send an email (V2)" action in Powerautomate

Configure the array as a list of attachment objects containing exactly Name and ContentBytes, then pass the completed array—not an individual item—to Send an email (V2).

Configure the cloud flow

1. Before the Apply to each loop, add Initialize variable:
   • Name: EmailAttachments
   • Type: Array
   • Value: leave empty ([])
2. Keep Get attachment content inside your existing Apply to each loop.
3. In Append to array variable, select EmailAttachments and append this object:

{
  "Name": "<attachment file name>",
  "ContentBytes": "<output of Get attachment content>"
}

Use Dynamic content for both placeholders:

• Name: the attachment’s file-name property from Get attachments—often displayed as DisplayName or Name.
• ContentBytes: File content or the body output from Get attachment content.

The property names are case-sensitive for this scenario: use PascalCase Name and ContentBytes, not name, contentBytes, Content, or another schema. A matching multi-attachment failure was resolved by correcting those property names to PascalCase.^1^

Microsoft’s Office 365 Outlook guidance likewise specifies that every attachment object must contain Name and ContentBytes, and that the completed list must be passed to the action’s Attachments property.^2^

4. Place Send an email (V2) after and outside the Apply to each loop. This ensures the array contains every attachment before the email is sent.
5. Open Send an email (V2) → Advanced parameters → Attachments:
   • Select the option to switch to input the entire array, if shown by the designer.
   • Insert the EmailAttachments variable as the complete value.
   • Do not place the variable separately into an individual attachment’s Name or Content field.

The final structure should be:

Initialize EmailAttachments (Array)
Apply to each attachment
    Get attachment content
    Append attachment object to EmailAttachments
Send an email (V2)
    Attachments = EmailAttachments

If the designer still rejects the value

Add a Compose immediately before the email action with:

variables('EmailAttachments')

Run the flow and inspect the Compose output. It should resemble:

[
  {
    "Name": "Invoice.pdf",
    "ContentBytes": "<binary/base64 content>"
  },
  {
    "Name": "Photo.jpg",
    "ContentBytes": "<binary/base64 content>"
  }
]

If the email action runs before the loop that builds this output, change its Run after dependency or move it below that loop. The matching Q&A resolution also required the send action to run only after all attachment-processing loops had completed.^1^

References

1. LogicApp failure when attaching multiple files to email. - Microsoft Q&A
2. Office 365 Outlook