This thread helps fix oops! We couldn't save this one error msg while trying to edit some photo files on Windows 10.
Solution 1: if you saved your photos on some hard disk... Right click on your own media folder > Properties... change the security of the 'Authenticated Users' to Full Control, making sure everything was ticked. Refer to the below imgs and...
Solution 2: if you saved your photos in the User folder.... right click user folder -> choose Properties -> Security -> Advanced -> at the top click change next to owner and manually type your own user/PC name as shown in the list below the button > verify the changes you entered > apply the edit you made.