I was having an issue downloading music on Spotify on my Galaxy S7. Most of my music had downloaded to my phone, but I starated downloading some random playlists to check out some new music and it froze in the middle of one of them and in my pull down notification menu it read the message that is in the subject line. No matter what I did it would not download my music. I restarted my phone, uninstalled, reinstalled, removed the playlists, tried different music. Nothing worked. Finally I went into my app settings and went to my application manager and selected Spotify. After opening this menu I selected App Permissions I selected storage to allow it, then I selected it again to turn it off. Upon turning it off, Spotify restated and when it did, voila, it was downloading my music again. I hope this helps someone as I was unable to find this solution anywhere online.