✳ PROCESSING DIAGNOSE
Diagnose: destination stuck at 0% / processing failed
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
Stuck or failed processing is usually triggered by a non-standard container/codec combination, an extremely high resolution, or a destination-side issue. Re-export with a documented preset; if the second upload behaves the same, the problem is likely destination-side and not your file.
Run the diagnostic tree
The tree combines this problem's static cause ranking with the values the diagnostic engine reads from your file.