I'm just jumping in to clarify how you can make a copy of a playlist 🙂
In the Desktop app, click Ctrl - A within the playlist you want to copy to select all the tracks. Next, right click and Add to playlist should appear. You can add them to an existing playlist, or create a new one.
Hope this is useful. Have an awesome day!
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“Music is a language that doesn’t speak in particular words. It speaks in emotions, and if it’s in the bones, it’s in the bones.” - Keith Richards