'Unable to attach YouTube video'

I know there is a similar thread about this from a few years ago but I’m making a new one because that one’s marked ‘Fixed’. Basically I’m trying to add some songs to the database and you can guess the rest from the thread title

What video are you trying to attach?

I can’t get it to work either, I can’t see any way to add Youtube to anything I create.

The button described in the Youtube vid doesn’t exist, tried the new and old editor.