Attribute: additional_image_link

Maximum character limit: 2000

URLs for up to 20 additional images of your item, separated by a comma (,), semicolon (;), space ( ) or vertical bar (|). Follow the same image specifications as image_link.

Since this field takes a string, the entire list of URLs must be formatted with double quotes. For example: "http://www.jaspersmarket.com/products/shirt2.jpg, http://www.jaspersmarket.com/products/shirt3.jpg"

To display additional images in your ads, see Dynamic Ads, Ad Template