Can anyone offer advice about posting?

A first-timer here, trying to offer a rare, collectible LP. All goes well until the "images" page. I enter four image files, they appear correctly, but when I hit the "continue" button, it says "no files found." I can't see anything I'm doing wrong, but cannot complete the listing. I've tried AudiogoN Help, but the woman there was no help at all. Is there a "save" function for the image files that I'm not seeing? Advice would be much appreciated.

Thanks,
John T. Henderson
[email protected]