A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
Dear respected RB_356,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
I’m sorry you’re having a problem and for the situation you encountered, we deeply understand the inconvenience caused and apologize for it.
As per your description, recently, we received reports from other community members that they encounter the same situation (Upload Failed).
Considering that different users from different organizations are experiencing the same issue, I'm afraid this issue could be a temporarily server-side issue which needs to be investigated and fixed from back end.
In this situation, I believe the problem should be further investigated by the related development team via collecting HAR logs because there is not any related service incident reported at the Microsoft Service Health dashboard.
I do feel regret for not resolving the problem and redirecting you to the related development team but the fix to your concern can be find out through the HAR logs and suggest you raise a support ticket from the Office 365 admin center, where the related team will investigate the problem further by collecting the HAR logs.
Reference: Get support - Microsoft 365 admin | Microsoft Learn
Note: To create a support ticket, you need to have Microsoft 365 admin privileges and if you aren’t admin of your Office 365 organization, please contact the admin of creating a new ticket.
Reference: How do I find my Microsoft 365 admin? - Microsoft Support
Please accept my Apologies for redirecting you to the related team support as the moderators in this community have limited resources to check the backend information, and to get the fast and better assistance we requested for it.
I'm sorry and I apologize for that.
Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Waqas Muhammad