If you are adding to CURRENT listings already on eBay, then its REALLY simple, but sometimes here lately it fails....
Just do it & if they don't show up at the bottom of your active listing, file a support case & the tech reps will have them sent over in a jiffy.
To add to Active listings..... click the LISTINGS tab, on the new page,
2. click the ACTIVE LISTINGS link at the right of the page
3. click the little box to the left of the listing you want to add pix to..
4. go to top of the page & click ADD pictures...
5. Photo selection screen will pop up & you choose your photo(s) to add
6. click ADD.
7. It will give you a confirm message.
8. Go to your ebay auction & chek it.
If they're not there yet, don't do it again....it will eventually send over the pics (or you have to file a support case) but if you do it 3-4 times, you'll get 3-4 duplicate pics in your auction.
Mine used to show up instantly. The last 6-10 times I did it, they don't show up until I file a support case, but support has been pretty quick to correct it each time.
good luck!