Hi Werner, I am assuming
1. you are using the block editor
2. Your concern is that you don’t see the controls when working on the backend editor. You are not talking about issues on the frontend.
If that’s the case, make sure you “Show Block Settings” by
1. Selecting the block
2. Click on the options (three dots)
3. “Show Block Settings”
Things seem to work fine on my end at least with an MP4 file. If you are using another file format and having a problem let me know.