I don’t think this can be done yet so I’m putting it in here as a possible future thing.
Background is I just prepared a few massive playlists to populate an MP3 player. Only got one USB slot (Surface) so put all the relevant music on the hard drive from an external drive that most of my library is on, and got it to rearrange the music into neater directories.
Trouble is, the playlists are still pointing at the external drive which has the old, untidy directories. I got round it by making a virtual device and syncing it all to that to generate new playlists.
What the idea was is if you have a playlist with dead links in, can you get it to search for other copies of the same tune - so same title, album, length etc, so it fixes the dead links in playlists by searching for other examples of the same tune?
Like I said I got round it, but I just thought it might be a useful thing to be able to do.