I think there was a miscommunication. Just to clarify, we pull your active eBay listings into Auctiva and they're shown on the Active listings page. Once those listings end, they're moved from the Active listings page and are then shown on the Closed listings page. Craig was describing how you can import a closed listing into a saved listing.
As for importing images, I cannot give a definite answer as image files are unique and vary in size.
However, I can tell you:
An image size of 1280px x 852px is about 67.04KB.
2GB / 67.04KB is 29,832.93.
So you can have around 29,000 images of the size 1280 x 850 in your Activa account and not accumulate any overages if you're in the Pro Plan which supports 2GB of image hosting space.
I hope that helps and let me know if you have any more questions.