Preview is Not Letting Me Open Some Photos
I had to take some screenshots of important documents for work, and I needed to open them. But, when I tried to open them, it just gave me a pop-up window saying, "The file “Screen Shot 2018-05-29 at 1.59.40 PM” couldn’t be opened because you don’t have permission to view it. To view or change permissions, select the item in the Finder and choose File > Get Info." I did exactly what it said to do, and it showed that I had permission to read and write, but it still won't let me open the file. I also did make sure that the image wasn't locked, and it was fine. What should I do about this?
iMac, OS X El Capitan (10.11.6), Cannot update,oldwith a DVD/CD Slot