How to change a playlist's cover art in the Spotify app for iPhone, or add a custom image

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· *You can change a playlist's cover in the Spotify app on your iPhone by rearranging your songs.*
· *When you make a playlist on Spotify, its cover will be a collage made with the album covers of the first four songs in the list. When those first four songs change, the playlist cover changes.*
· *There is a way to...