GIFs uploaded from GBoard don't work

GBoard (Google's keyboard for Android) has a GIF entry feature.

Sync properly uploads the GIF from GBoard to my Lemmy instance, but the GIF does not play in the comments, and clicking on it returns an error "image was actually a web page!"

For the record, they're not technically GIFs. GBoard uploads the image as WebM.

This seems like a user journey that should be supported. Android users who use Google's keyboard to input a GIF comment would expect it to work or throw an error at upload time. Instead, Sync allows us to submit such comments, but they are broken upon viewing.

Device information

Sync version: v23.11.29-22:27    
Sync flavor: googlePlay    

Ultra user: true    
View type: Smaller cards    

Device: ASUS_AI2302    
Model: asus ASUS_AI2302    
Android: 14