Well, I finally got a reply, from Support, and was able to get my ten photos to show up in my listing. Here is what Allen, in Support, suggested:
"I would clear your confusion with revising the listing function. Whenever you make any change in the saved listing of the active item, the changes won't reflect in the active item automatically. You'll need to revise the listing via the following steps:
1) Locate your listing in your Saved Listings folder, make any necessary changes, and save.
2) Click the "<HTML> icon to the right of the item on your "Saved Listings" page
3) Select All and copy the html in the popup window.
4) Locate the item on eBay and click the "Revise Item" button.
5) Scroll down to the "Description" section and then click the "HTML" tab above the description editor.
6) Delete the existing description HTML, paste the copied HTML in its place, and save your changes.
I followed these steps, and now have images within the template, of my active listing.