I have had this problem numerous times before and this is what I do. I list directly on eBay site and use their FREE 1 photo that I upload from my own picture file on my own computer. Then I go to Auctiva.com, click active listings, click on a listing I want to add extra photos to and click on add photos option in upper bar. Then I upload photos to my Auctiva photo file and add from there to the listing. This way, if Auctiva is down, I have at least one photo in the listing (from ebay)
hoppyeshopper
bargainseekersintl.com
my future Auctiva commerce store