Hello, I have been having an issue where I am unable to change playlist cover images. Uploading the image and clicking "Save" results in the "Save" button becoming dark green (see screenshot), but nothing happens even after I leave it for upwards of 5 min, and I have to click outside the popup or "Cancel" to continue using Spotify (which prompts me with "Don't you want to save your changes?"). I have tried restarting the app, but the problem has persisted.
I'm running Spotify 126.96.36.1993.g15c26ea1 on macOS High Sierra 10.13.5 if that information is useful. Cheers!