iPhone 6 won't sync local files from computer

[bwest16]

I had to restore my iPhone 6, and now local files from my computer don't appear in playlists, and I am not able to save these playlists offline on my iPhone.  In the past, I never had any problems doing this.  Also, I noticed in the new version of Spotify for desktop, there is no Device menu where my phone appears.  I already tried uninstalling and reinstalling the app on my phone, and I still have the same problem.  Does anyone have a solution for this?