Hello,
I know this is a niche issue.
I am an attorney. For security and personal reasons, I am attempting to migrate to POP OS (linux) for as much as possible.
Certain .mp4 videos do not work on COSMIC media player.
Where it has an orange icon, it won't load.
Where it has a thumbnail, it will work.
I'm not sure what determines whether the video will work or not, but it would be great if I could use COSMIC media player for all video files.