Subscribers can save their sent files for an unlimited period of time by clicking "sent emails" and clicking "save".
Another option for users is to purchase JUMBOcodes which allow to save existing mail for a period of 6 months or send file up to 20GB.
After selecting the upload files, a window will pop up asking you to enter the JUMBOcodes you purchased. If you purchased JUMBOcodes to save an existing file, the download page should enter the code in the save box.