Didn't IBM do that many years ago with Lotus Notes integration with Quickr (formerly Quickplace)?
Let's see. I choose a file from Google Drive (Quickr) and insert a link into a Gmail (Lotus Notes). Then, I send the email to a user. If the user is authorized to the file, he/she downloads the file from Drive (Quickr) and voila.
Google markets it as 10GB attachments and the crowd goes wild at the...ahem...innovation.