Yeah, that would probably be the fallback if I can’t figure something out. That would be a fantastic new feature to add to ACF galleries. Just some way of flagging one or more images as being “special.” And giving the option of whether one or more could be flagged. That way the theme developer can choose what to do with those special images.
I’ll keep searching/thinking of a way to add radio buttons to the images in the meantime. 🙂
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