And are the permissions on that folder set to allow writing?
How do I determine that?
Right Click on Folder
Scroll Down to Sharing & Permissions
Look at your User Name
Do you have Read and Write or just Read permission on that folder?
It says read and write.
I went to individual image files within the folder, and those showed that I only had read permission. I was then able to change to read & write and that enabled filename changing.
Thanks for pointing me in the right direction.