Working on a Pages document, I chose Share > Export > PDF and saved it to iCloud. The PDF didn't appear in Preview's list of iCloud PDFs, but still appeared in Pages' list of documents as a greyed-out PDF (because Pages can't natively open PDFs). Thanks. I just created an unusable document. I had to drag the greyed-out PDF out of the iCloud window onto my Desktop, and drag it into Preview's iCloud window. LOL. I'm not complaining too much, mind you, because we all know iCloud still has a ways to go before it becomes a full-time document storage solution.