Kit Kat won't let most apps write to the external SD card. To mollify some of the unwashed ("My phone has no SD card") they're labeled part of user storage "internal SD card". What a joke.
This is why I had my update frozen by last week, and it's staying that way until I see if they change things back more to the way users want it or keep it the way they want it. If they don't change, my updater stays frozen. I'll stay on 4.3 until it's time to get another phone, then sell this one on Swappa, 4.3 or whatever the current version is, buyer's choice. In about 2-3 years. This one does all I need or want.