I guess the problem is about mobile version of it. See this: https://lemy.lol/comment/9734206
About the video playback problem; I’m not sure. I can play videos in Safari without a problem but can’t on Firefox. Maybe a codec problem? Can you try the video with another browser to confirm me please?
Absolutely. I’m not someone like who “I’m not doing it but you should do it this way” guy but this particular problem is bigger than a single pull request.
There are tens of apps/web UI’s with different languages/frameworks. I can’t make PR for all of them :/