Hah, I just saw this when updating Star Wars posters and found this after googling the very same thing. You beat me by five hours.
What’s going on with this? It’s such a horrible tease. I’m guessing/hoping one of two things:
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straight up interactive interface where we can drag/drop items into position. I doubt this one, as it’s more work, but it’d be cool.
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A “sort order” numeric field in media details that’s only active when placed within a collection set to custom sort order. Put numbers, it sorts by those numbers, done.