Question: itunes syncs songs to iphone but playlists don't contain them
I've got itunes 12.7 on a Mac and an iphone 7. I have a couple of playlists that are large (> 1000 songs) that I set up on the computer and sync to the iphone. I recently added a new album, and added some of the songs to each playlist. I have iTunes set up to sync those playlists to the phone. The songs synced, but they don't appear in the playlists on the phone. What's going on?
iPhone 7, iOS 11.1