Getting myself all confused about iWork document sharing via iCloud. Just for me, everything works fine, my iWork documents are accessible & editable on my iMac, iPad and iPhone and via icloud.com, no problems there, everything works great. When I send a shared link to a friend via iMessage, on his Macbook if he selects the link he opens the shared file on iCloud.com and on his iPad he's prompted to use a Mac/PC to access icloud.com or to download a standalone copy to his device. My questions is, can I share a document so that my friend can work on it using the iWork app (Numbers in this case) installed on his Macbook, or can he ONLY edit it on the icloud.com website? Thanks.