With the recently released 2013 versions of iWork for OS X and iOS, syncing documents across Macs, iOS devices and even iWork for iCloud is now a seamless transparent process: Open and edit a document in one location, and the changes are instantly reflected at every other location that has access to the file. With very few exceptions, a document's appearance remains identical on each platform. Warnings about file conversions and omitted features have all but vanished.For anyone who has struggled with iWork file syncing over the years, this is fantastic news. It wasn't always this way.In the beginningWhen Apple introduced iWork for iOS apps in 2010, transferring an iWork '09 document between a Mac and an iPad required a