No, that's what we did. But it did not work. If you are thinking about Netflix or Kindle App, 1.14 of the "App Store Review Guidelines" says: "Apps can read or play approved content (specifically magazines, newspapers, books, audio, music, and video) that is subscribed to or purchased outside of the App, as long as there is no button or external link in the App to purchase the approved content. Apple will not receive any portion of the revenues for approved content that is subscribed to or purchased outside of the App."

So that applies to only magazines, newspapers, books, audio, music, and video subscription/content services. "Cloud Storage" is not included in the list. This is what was told to us by the Apple guy who we were talking to.