Catterwaul

Hi. I'm a new user and was curious if there's something that I'm doing wrong. For some reason I can't seem to add any of the playlists that I have. It doesn't matter if they're public from another user or if they're my own unlisted ones. What I'm doing to get the playlist ID is to open the playlist and copy/paste the URL directly from my browser. If I try this with adding a channel, it works fine, but when I try this with a playlist from the same channel, I get the error, "must be a channel or playlist URL". Clicking on the three dots/hamburger menu for a playlist doesn't seem to give me other options to identify the playlist URL, but I assume it's something simple that I'm likely missing. Is there a different way to grab a playlist URL that I should be using instead? EDIT: Also curious how to set the amount of simultaneous downloads ... I don't seem to see any way to do that.