If your GM makes you a Co-GM (perhaps temporarily) then you can make a map as a Co-GM in their game. If your GM has a Pro subscription, they can create a side game that has you assigned as Co-GM, you can make the map there, then Pro GM can use Transmogrify to move the map into the main game where you are a regular Player, Non-Co-GM. <a href="https://wiki.roll20.net/Game_Management#Game_Detai" rel="nofollow">https://wiki.roll20.net/Game_Management#Game_Detai</a>... <a href="https://wiki.roll20.net/Transmogrifier" rel="nofollow">https://wiki.roll20.net/Transmogrifier</a> Note, these solutions don't work for a map you already made in a separate campaign you created, but these methods work for permitting a player to make a map in your GM's games.