Microsoft Edge version 90.0.817.0 (Official build) canary (64-bit)
you're going to need to enable this new flag first:
edge://flags/#edge-video-comments-pdf
You can add .webm format videos that are hosted online(like OneDrive, GDrive etc) to PDFs as comments. Edge will support inline playback of these videos. (Note: Users should have permission to access the video(URL) to be able to view it.)
available on: Mac, Windows
I added a 1080p mp4 file. you can move the video comment to anywhere on the screen, also can watch the video comment in full screen.
Very nice feature in my opinion.