I sent in a Gallery URL, but eBay doesn't use it. What's going on?

I was listing an item with AddItem and I've specified a GalleryURL and a PictureURL.  Instead of using the GalleryURL I included, eBay is using the PictureURL instead.  Why is this?

This is a side effect of the 'free gallery' image now offered on many eBay sites.  On sites with free gallery images, if both PictureURL and GalleryURL are specified, then eBay will actually use the PictureURL as the gallery image.  This behavior is documented in AddItem:

http://developer.ebay.com/DevZone/XML/docs/Reference/eBay/AddItem.html#Request.Item.PictureDetails.GalleryType

AS of 10/3/2008, US (0), Motors Parts & Accessories (100), CA (3), UK (3), CAFR (210), FR (71), NL (146), ES (186), and IT (101) all offer free gallery images, and will follow the above behavior.

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