Quinn - I have an issue related to this. I have a subclass of NSURL in my iPad app. When I enable MacCatalyst, I'm given an error 'required' initializer 'init(pasteboardPropertyList:ofType:)' must be provided by subclass of 'NSURL' However, when I add that initializer, I get another error NSPasteboard' is unavailable in Mac Catalyst I have been unable to use conditional operations to silence this warning. Please advise.