Spotify - Songs Won't Synchronize to Offline Mode FIX (Playlist, Sync, iPhone, Android, Phone)
Here' a guide on how to fix the problem where your Spotify songs won't synchronize on your phone, be it an iPhone, Android or another type of smartphone.
The problem can be noticed when the arrows remain gray and/or one song's arrow disappears.
Just free up some space on your phone and you should be set to go :)
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