Cannot open Keynote files from iCloud on my Mac
The new Keynote cannot communicate with my iCloud! Existing presentations (created with older versions) cannot be opened; and if I start a new presentation and try to save it, I get error messages such as "'Untitled.key' couldn't be saved."
HELP! 😠
MacBook Pro, OS X Yosemite (10.10), Keynote 6.5