Normally you can copy a Banner by placing a blank one in the crafting table with a decorated one. However, this doesn't seem to work in Aspiria. Has the recipe been changed (if so how do I do make copies now) or is it removed and I just need to purchase each one I want?
To copy a banner, the Original and the Blank banner must have the same base color. For example, if you hover your mouse over the Original banner, and it says "Red Banner", you'll need to craft it alongside a blank red banner.