Sorry for OT-ness but this group has such a diverse and keen knowledge of things ;o)
Right, iPhone 4S, iOS 6.0 (yes, I know they're up to 7.x but each update breaks something else and it's working well with good battery life now so if it ain't broke...)
I had over 500 photos on it so copied them over to the computer using Windows Explorer, then deleted off phone. I need to put about two dozen back on the phone, but it won't let me put them back where they came from.
When viewed in Windows Explorer (Win 7 SP1 64-bit) the iPhone just shows up as a removable device. Double-clicking it then shows a folder called DCIM and double-clicking that shows a folder called 860OKMZO and all the photos were in there. When I select the two dozen I want to put back in there, I can drag and drop them in the "Root of removable device" but I can't drop them in either the DCIM folder or the 860OKMZO folder. They came out of there so why won't they go back in there? Is there any way to get them back in there?