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Or the person that sent the post with the wrong attachment, could send another another post with the right attachment, and say something like "Woops, I included the wrong attachment with my first post, and this is the one I meant to send."

That's what I would also suggest, with the addition of after doing that, the mod (or the original poster if allowed) of that message edit the original online-posted message (using the Hamburger-More menu), to delete the erroneous photo attachment, and add a bold sentence in the message body text pointing about the photo being removed because it was the wrong one and the correct photo is in message 12345 further down this thread; the 12345 message number could also be hyperlinked to the permalink of the corrected-photo new message. When saving the edits I would also choose to resend the message to the group if it would be beneficial.

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Cheers,

Christos

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