Update: after adding .webm to the title it was possible to upload the file.
I suggest either:

Hello @Aklapper , no there is no reason and Gopavasanth is not aware. I thought maybe you don't want to be spammed by these tasks. I didn't know that I shouldn't do this. Apologies for the inconvenience caused. I will make sure to keep you in future tasks.

Hello @Aklapper , no there is no reason and Gopavasanth is not aware. I thought maybe you don't want to be spammed by these tasks. I didn't know that I shouldn't do this. Apologies for the inconvenience caused. I will make sure to keep you in future tasks.

@Aklapper Hello, no there is no reason and Gopavasanth is not aware. I thought maybe you don't want to be spammed by these tasks. I didn't know that I shouldn't do this. Apologies for the inconvenience caused. I will make sure to keep you in future tasks.

Hello @Reputation22 ,
Thank you very much and wish you All a happy new year.
I tried to test this but I think it's not working correctly. After selecting the video, the category is no longer displayed in the url, and in the last step I can see the following category:

Thank you very much @Gopavasanth @Reputation22 !

Thank you very much @Dzahn :) !