Justin Esgar built iCloud syncing into SignMyPad so users could access the documents on their iPhone as well.
Nonetheless we were denied for our use of iCloud. Apple’s reasoning was that they will not allow iOS applications to use iCloud to sync “non-user-generated” data between devices. After some lengthy followup, we learned that while using a “drawing application” to create a new piece of art and then saving that file would be considered “user-generated”, using our app to add a signature and content to a PDF and saving it as a new file is not “user-generated”. The exception, of course, being for Apple’s own iOS applications, like those in iWorks. So after a long phone call with Apple that equated to my logical arguments being repeatedly contested with the same sentence from an apparent script (“your app does not follow our guidelines regarding user-generated documents in iCloud”), what was their recommendation for how to get over this hurdle? Use a 3rd party iCloud competitor. Wow.