Hello,
FTP is needed for files over 2 GB by default. Try FTP upload. Please contact your campus administrator if FTP is not enabled. Your admin is the best resource for alternatives if FTP is not active and will not be (admin loads data into libraries, and the like).
Please note that the target FTP server is usually the same as the instance's base URL and the credentials (email/pass) are the same as for your Galaxy account on that instance. This information is unique for every Galaxy instance. Try using Filezilla if you are not comfortable with FTP on the command line.
Take care,