After moving Spotify (4.0.0) to my new iPhone (6S, iOS 9.0.1) last week my local songs didn't play anymore. No *.mp4, no *.mp3, none of them. They play without any problems on my desktop (Mac, 10.10.5). I had no clue why so I decided to delete and re-install the app. Now my local songs don't even sync anymore. Both, desktop and iPhone use the same WiFi connection. I also tried to connect the iPhone via lightning cable, with no success. The iPhone doesn't show up under devices on the left hand side.
Any solution for this one?