animated and transparent AVIFs lose transparency when resized.

[machineonamission]

This is the avif file I'm using, which has transparency and is animated, doesn't animate when embedded normally in Discord, but does animate when it's opened in fullscreen (ie bypassing the resizer)

ose-f67d949a.zip

transparent AVIFs and animated AVIFs separately seem to work fine

[skidder]

Hi @machineonamission !
This particular AVIF doesn't display in the Discord client because it's both high-resolution (1598x833 pixels) and contains a large number of frames (1091). While either factor alone wouldn't be problematic, the combination exceeds Discord's 30-second timeout limit for the resizing operation.