I have a Galaxy S7 with Android 6.0.1 and Spotify version 220.127.116.112.
Like the title says, "previous, pause/play, next" functionality as well as the album art are all missing from the notification bar on both home and lock screens. All Spotify notifications are gone other than when it's syncing music to a playlist.There's no indication that Spotify is even playing in the background other than the actual music.
I've made sure that notifications are allowed, I've uninstalled and reinstalled the app and the problem went away for about a week. I need a permanent fix.
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