AuctivaSeller,
While it is possible to revise your active eBay listings and the unsold ones you will be relisting to include Auctiva templates, image hosting, and other design features, doing so would require redesigning each listing through Auctiva and then applying those designs to the associated eBay listings using eBay's "Revise your Item" form.
The first thing you would want to do to accomplish this is recreate each listing you would like to revise in this manner through the Auctiva lister page. After designing each one, you would want to to just click the "Save" button to save the data on your Saved Listings page within Auctiva.
It is possible to add Auctiva templates to the saved listings you have already created using the Upload from File tool in bulk using the "Find & Replace" button at the top of your Saved Listings page. However, it appears the listings you uploaded from your CSV file do not have images either and you would have to add the images to each one indivudually.
Once you have redesigned these listings through Auctiva and you have them stored on your Saved Listings page, you can then apply those designs to your active eBay listings by revising each one via the following process:
1) Click the "<HTML> icon to the right of the item on your "Saved Listings" page
2) Select All and copy the html in the popup window.
3) Locate the item on eBay and click the "Revise Item" button.
4) Scroll down to the "Description" section and then click the "HTML" tab above the description editor.
5) Delete the existing description HTML, paste the copied HTML in its place, and save your changes.
In order to make similar changes to any closed listings that you intend to relist, you would want to relist them in their current state first and then proceed to revise them using the same process mentioned above.
On the other hand, if there are any products on your Saved Listings page that you would just like to post to eBay as new listings, you could simply open them up from your Saved Listings page, make the desired changes from there, and then post them to eBay using the "Post" or "Schedule" buttons at the bottom of the listing creation page.
Hope this helps.