I have a custom playlist that I had on my phone before the update. I backed up to my PC, which the playlist still shows. After the update, many of the recent songs I have don't show up. I even tried removing and adding it again but they refuse to show up. However the songs are on my phone because I can play them when I search for them. So the playlist isn't compatible or something. What is going on here? What did iOS 10 do to my playlist?