iPhone doesn't sync 'YOUR MUSIC' when added from desktop unless the iPhone app is open

[demoleas21]

iPhone doesn't sync 'YOUR MUSIC' when added from desktop unless the iPhone app is open. If I add a song on my desktop app it does not show up on my mobile device until I manually add the song again on the iPhone itself. If I leave the app open on my iPhone while adding songs on the desktop app it does work. I've tried restarting my iPhone app and logging out but it didn't help.

[adriank1410]

Spotify needs to be in the foreground to sync songs and playlists. Also, it doesn't support local files that were added on different device.