Need help? Check out Spotify Answers for solutions to a wide range of topics.
If you're trying to sync Local Files to your mobile form your desktop, but for some reason certain songs won't sync and stay grayed out, you can usually solve it by double-checking the following:
If the track still just won't sync, here's what @Jacob_ suggested:
Didn't help? Search for more Spotify Answers, or create a new thread and ask the Community.