Actually, you can add an image from outside the images folder, by clicking on the box about the add line for folder images. But... thinking maybe that was the issue, I actually unzipped the epub file, added two images, and rezipped. The images show up in the zip file, but are still unusable inside of Sigil. Still get the error message that I'm not allowed to open the files. I made them, so that's a stupid statement, and I am shown with full rights to work with the files in the file Properties.
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