iPad Air 2 iOS 8.4 Spotify 3.7.0.1100

Steps to reproduce Bug:

#Sync Playlist for Offline Mode

#Switch Spotify app to offline mode

#OfflinePlaylist can be played and is showing all covers - the small ones in the lower status bar as well as the big ones in the fullscreeen mode and in the lockscreen mode

#Quit Spotify app

#Restart Spotify app

#Offline Playlist can be played but is only showing the small covers. Fullscreen or Lockscreen will only display the generic note symbol.

!!! Warning, this bug will lead to high mobile data consumption since Spotify will reload all big Cover Arts during playback, each time, even with the setting "sync via mobile" disabled !!!

It looks like Spotify is caching the big Album Art Covers in a temporary folder which gets deleted after closing the app.

Spotify should cache the big Album Art Covers in a permanent folder if the song is marked for offline availability.