I understand how to set the cover ("key") photo of an Apple Photos album, but I can't see how to change the cover photo of a "shared" (copied) album.
How do I set the cover photo of a "shared" Photos album?
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There's no way to do this. Though you can temporarily set a "key photo" (though a surprisingly awkward procedure), that will reset to the first photo in the album as soon as any photos are added.