ehm ... I suppose it's possible to update videos on youtube w/o creating a new link. I'll check ASAP.

But I'm interested to automate this, uploading 70 videos in one run was easy, but I won't be able to do manual maintenance!

FYI: The YT-Videos are created out of the Quicktime format -> [Q] symbol.

I will try to additionally upload the mobile versions in the coming weeks. The have lower quality, but have picture in picture format.