Wow… Thank you James. It works. Thank you, Graham I got the embed code! 
May I ask something else too? How did you manage to figure out how to do it? I mean ignore the visual mode and take the embed code, instead of the url that works for YT videos, and then embed this code on the text mode.
I’m asking because I have to admit that I didn’t even think to do this because I had the impression that the visual mode ( and the insert editor’s button ) would probably work with all videos from all videos platforms.
I mean that I went for the obvious and visible option that it is there for that purpose.
Anyway… thank you very much for your help. 