I am sorry for the very stupid question but I cannot for the life of me see how I am supposed to add sheets to a game I am using this link: <a href="https://roll20.zendesk.com/hc/en-us/articles/360045613693-Pathfinder-Second-Edition-by-Roll20" rel="nofollow">https://roll20.zendesk.com/hc/en-us/articles/360045613693-Pathfinder-Second-Edition-by-Roll20</a> I have got as far as setting up a game and picking the sheet from the drop down menu. Then what? There doesn't seem to be a way of downloading and then uploading one. I seem to have missed something fundamental