Loading the videos on any other device such as on a iPhone or on a desktop computer work just fine. Was there a specific change made to how videos are uploaded that causes this issue? I’m also not sure if anyone else has this problem since I don’t see it talked about on here.

webm posts are currently having their mp4 samples regenerated. all browsers on iOS are unable to display webm files, so for a while you'll be unable to view some videos in-browser on an iPhone/iPad.

see: this

There is at least one app for iOS and iPadOS that opens WEBM. VLC isn’t perfect by any means, but it does a good job.

A word of caution though: you should be aware of any potential heating while watching a WEBM on any Apple mobile device.