Currently, players do not have access to art libraries in game. That means that if they wish to use an image from another campaign, they need to reupload it. There are two big issues with this. Duplicate images from different campaigns can clutter up the art library. It uses up storage space. Some artwork may be difficult to find again, if not saved on a player's computer. I have seen this proposed before and the topic closed , but it appears that the Roll20 team member was not aware that the art library is only visible to the GM in a campaign, not to the players.