(Edit: Oops, realized after-the-fact that I'd started this thread. Wish someone cared.)
LSlowak wrote:do you have the Dropbox app installed on your iPad?
Should work as expected both with files and projects afterwards.
FWIW, this has never worked for me either. I've tried quite often with different Cubasis and iOS versions (just confirmed that it fails with iOS 8.0). I get the same "The following error occur...rrorDomain error -1001.)"
error that other people have reported.
I've been able to transfer mixdowns in the past using "Open with" and then choosing Dropbox, but even this is now failing with iOS 8.