
Then when I click OK I get an error that it couldn't write to the file.

I get these same messages if I open a file from Pictures and then try to save it. I also the error if I try to save it to my Documents folder. BUT I can save it just fine to any other folder on my C-drive (or any drive) and can even save it in my Videos folder. But absolutely cannot save to my Pictures or Documents folder with PSP 2018.
Also, if I open an image from Pictures with Photos, FastStone Image Viewer, Paint, or any other application other than PSP 2018 and it WORKS PERFECTLY. I only get those errors when editing and trying to save with PSP 2018.
Any idea why this only happens with PSP????