Akin to your e-mail inbox, when other users send files to an i-drive, they arrive in the Dropbox folder. When you enter the i-drive, (1) click on dropbox, (2) then select "upload", (3) then proceed as prompted. You can send (upload) any size file ( pictures, programs, letters, video, music, etc.). Please, be patient, it can take a while to upload a large file.