I figured it out and it worked! The language is the problem. At first I tried to name the video in Bulgarian (this is Cyrillic) - again and again. Then I named it in English and it worked perfectly!
Then I edited the video from the Red button and changed the name in Bulgarian again.
Here you can see the video: https://d.tube/v/kogitalnost.com/6xi8u52o

I keep my fingers crossed for you as well!