While its true that in theory anyone else can have access to the files they have uploaded, they need the weblinks to those files. In practice, its extremely private - no one is going to see those files unless you share them. Can others have access to the files that the DM uploads? If you mean can you upload files into your account, and then let others use them in the campaign - like say, you upload a graphic in your account and another GM wants to use that graphic as a token in their campaign - not really. You'd have to give them the weblink to the file, then they'd have to open another browser page (outside roll2o), go to the link, rightclick on the picture, save it to their pc, and then upload it to their account. So it's possible, but its not very practical.
