I'm new to DMing with Roll20. Getting ready to try my first run with it. We are going to use some of the adventures from TFTYP, so I purchased the add-on from the market place. Upon adding one of the add-ons to a game (The Sunless Citadel), I can see all assets in the Journal. The maps are there as handouts, but I don't see how to set them as the map for the game. Am I missing something?