I have a 2010 MB Air and an 09 iMac, both upgraded to Yosemite. On my iMac, the iCloud drive shows up in Finder but I can't move anything to it and it won't find documents that i've put in iCloud from my MB Air, Am i doing something wrong? Also, can you not use Dropbox anymore? That's what I was using in the past, but it doesn't look like you can use it with the update? Any help would be appreciated.