I do not use iOS, I use Android, though I am a Mac and iCloud user. I have several Numbers spreadsheets that I share with other people that without warning no longer share!!!! I am told I need to upgrade to iCloud Drive on my iOS device, which I do not have one. I am told I need to upgrade to Yosemite to continue sharing my files and unless I am mistaken, Yosemite is not available!!!!!! And, I can no longer log into iCloud to even see my files because I have not upgrade to iCloud drive on my non-existant iOS device or through Yosemite which is not available!!! Am I missing something here????