address before provisioning your UNC Charlotte Dropbox for Business account. Could this be what's happening here? dropbox.mtsac.edu is a service to make it easy for you to move files, including large files up to 10.0 GB, in and out of MtSAC. If you already have an existing Dropbox account registered with your “@gsu.edu” campus email address, you’ll be able to choose whether to continue to associate existing content with your “@gsu.edu” account by merging the accounts or migrate your existing Dropbox content to a new account using a personal email address after you log in with your CampusID and password the first time. When you check your "All Files" page online, do you see a purple folder with your name on it? If you don’t know or can’t access the email address associated with your Dropbox account, there are a few ways you can try to sign in.