I just tried adding an Ally to one of my characters (setting is not relevant for this question), set it to be a creature and selected Horse, War as the creature type. But I noticed that if I try to add armor (barding, of course) I get a response that there is "Nothing to choose from!" I'd like to add with the Editor barding for mounts so they could be selected from the character screen. How do I do that? I can't figure it out.