We'd like to add some sort of chooser UI that allows you to pick from the images for the slot. The only issue is that Spine does not load all the images all the time, instead it loads only the images needed. To show them all at once we'd need to load them, which could take some time if they are large. We could show a placeholder until they are loaded.
Were you thinking of a hotkey? How would it work? I suppose it could make the next attachment visible, so you'd press it until you get the attachment you want.
