It appears that I have given you a partial answer.
Tophand and I appear to use IH in completely different ways, so you have to put our experiences together to get the full and correct answer
Sounds like tophand always uploads images one at a time via the IH admin and it auto-renames the additional images as it knows to which product and product image they are related.
I always prepare my images locally, often using Photoshop batch actions on whole directories and then FTP the whole lot in one go, and have to rely on correct naming to allow Zen Cart and IH to make the connections. (My product details including the product_image are also uploaded in bulk by Easy Populate).
Apologies for any confusion.
Bookmarks