I am sorry to hear that you have run into further difficulty with the Gallery image on your eBay listings. Unfortunately, as noted above, if the header image is showing in the actual listing, we submit your image to eBay and the problem occurs after we have provided the data to eBay. You should be able to have this resolved using the tool here.
Unfortunately, there is no way to transfer your images to eBay other than when you post your listings and please note that eBay would not host your images that are not in use in your active listings. You can retrieve your images from within the Image Management page of your account as needed, but please be aware that we have no options to have them sent to you or have them retrieved in bulk.