Hi, is it possible to send me your XML file for investigation. You can should be able to compress it as .zip file and attach it to a direct message to me in this forum.
GarageSale did only upload the first URL-based image to eBay. I guess this rule dates back to the times when images except the first one did cost extra. I changed the code so that all URL-based images are sent to eBay, if images on the targeted eBay site are free. Here is a special build including that fix:
Even though GS6 showed the image, I doubt that you were able to upload a listing using it to eBay. GarageSale probably didn’t check the URL prefix and image display just worked by coincidence.
Getting the feature to work as described by you in GS7 is hard. GS7 is sandboxed, which means it cannot access arbitrary files on your hard drive unless you specifically point it to by choosing the file in an “Open” panel.