✳ CAPTION DIAGNOSE
Diagnose: burned-in captions are cut off or hidden behind UI
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
Burned-in captions usually fail when their position overlaps the destination's UI overlay (caption track, profile, like stack, share bar) or when the canvas crop clips them. Move the captions into the safe zone and re-export; the destination's safe-zone data lives in the shared registry.
Run the diagnostic tree
The tree combines this problem's static cause ranking with the values the diagnostic engine reads from your file.