✳ UPLOAD DIAGNOSE
Diagnose: destination rejects the upload
Dynamic diagnostic state for this problem. Choose a file to run the diagnostic tree; the page rerenders with ranked causes and recommended fixes.
Direct answer
An upload can be rejected for size, duration, container, codec, processing, or account-policy reasons. Read the exact error message; the destination usually names the cause. Check container, codec, size, and duration first; account and region rules vary.
Run the diagnostic tree
The tree combines this problem's static cause ranking with the values the diagnostic engine reads from your file.