Hi CaptDJB,
In order to make changes to active listings that were not created through Auctiva, which are reflected as "Imported Listings" on your Active Listings page, you would need to do so using eBay's "Revise your Item" form. However, you can still add images to such auctions using the "Add Images" button on your Auctiva Active Listings page.
Any additional questions or concerns? Please file a support request using the appropriate link on our help page:
http://www.auctiva.com/free-auction-software-help/help.aspx-Mike