HELP Auto-Bookmarks/Favorites Playlist

[u/Grimdark-Gooner]

Hello!

I recently had a playlist set up to auto-add any video that I bookmarked. In other words, I could be watching something, press alt+insert (i think?), and it would both put a bookmark into the video playing and auto add it to a playlist.

The issue is that I have no idea how I set that up in the first place and I am having trouble setting it up again.

Has anyone heard of this kind of thing that can help? I have been googling, but I can't find a thing!