I wanted to try out the document collaboration feature for iWork. So, I had a friend write out something in Pages on iCloud.com and share the document with me. They sent me the link, and I get access to it just fine. But when I click the link, it doesn't put a copy in my Pages documents folder in iCloud. So, how do I save it in iCloud, so I can have the ability to edit across iCloud.com and my iOS/Mac devices with Pages on it? Is this possible? Or do I have to constantly go back to the link each time? Thanks!