I spent a few minutes seeing what I did but nothing jumped out at me in the time I had.
I probably never expected video to be used so it looks like it is being cleaned at some point. It might be with the editor (that is no longer supported so the documentation leftover isn't great anymore) is stripping it upon submission. I will have to figure out how to enable that. No promises on the timing though, you may have to settle for the link for the time being. Sorry about that.
I will keep video in mind if I get a chance to dig into this code again! Will also keep it in mind for the future...
Sorry I couldn't be of immediate assistance!