Hi @KimFucious,
I am also trying to work with this edit playlist API. When using it, all scenarios end up with all the songs in any one of my playlists being deleted. Are you running into this issue? If not, could you explain slightly more in-depth how you got the API working? When you mentioned using preferredSource: .catalogand it not crashing, did the edit work?
CPDigitalDarkroom
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