A family of Microsoft word processing software products for creating web, email, and print documents.
Hello,
This appears to be an emerging issue with Office product on iPad/iPhone after the recent updates. I am seeing multiple users reporting the same behavior: Office app gets stuck while saving, changes may not be retained, and it can happen whether the file is stored locally or in OneDrive/other cloud storage.
I haven't found an official Microsoft acknowledgement or fix yet.
As a temporary workaround, if possible, try opening the workbook using Office app for the web in Safari or Chrome. Other affected users have reported that the browser version is still able to save normally.
Please also make sure you use the in-app Help & Feedback feature to report this bug.