I've read all the stuff about Dropbox and have the apps on both my iMac and my iPad. Now how do I get it to work? Example: I have a paper written on my iPad in Pages it is about 1500 words long and I want to work on it on my iMac. How do I get it from Pages on my iPad to Pages on my iMac? I can find no instructions on how to do this. Thanks for any help.