There are a few different options available for additional pop-ups on your product page.
You can have more normal pop-ups. This is generally recommended if you are only looking at having 2 or 3 more. You will need to provide ALL your pop-up images in the 3 sizes and properly labeled.
Images must have:
Make sure you number correctly taking into account that the store orders images 1, 10, 11, 12…19, 2, 20, 21, 22… Etc.
Once you have decided which option is best for your product, send the required images to the publishing department alond with your product's name and any other information you feel the publishign department would need to make sure these are implemented correctly.