iCloud Drive Bug Could Erase Your iCloud Data
If you’ve enabled iCloud Drive, be leery of using Settings > General > Reset > Reset All Settings to reset an iOS device, as doing so could erase at least some of your iCloud data. MacRumors has confirmed that activating that option after upgrading to iCloud Drive deletes all iWork documents stored in iCloud. However, iCloud documents that cannot be accessed by iOS, like those in Preview and TextEdit, appear to not be affected. Just another reason to hold off on upgrading to iCloud Drive until Apple works out the kinks.