Spotify notes that you can only save one custom cover art per playlist at a time, which means that when you create a new one, it will automatically replace the previous one for that specific playlist.

P ersonalizing your Spotify playlist by uploading your own covert art image is a great way to put a visual stamp on your audio mix, but now, you can design that cover art right in the app ...

Phil Nickinson / Digital Trends Personalizing your Spotify playlist by uploading your own covert art image is a great way to put a visual stamp on your audio mix, but now, you can design that ...