✳ FORMAT DIAGNOSE
Diagnose: destination says the format is unsupported
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 unsupported-format error may refer to the container, the codec inside the container, or the upload surface. The filename extension alone cannot distinguish these. Confirm the destination's documented format list and re-export from the original if needed.
Run the diagnostic tree
The tree combines this problem's static cause ranking with the values the diagnostic engine reads from your file.