When using two or more images for one product, you can designate one of the images as the default image. The default image displays on the product list page and first on the product details page. To designate an image as the default, add
.default to the end of the file name.
In the following example, sku12345_toyslide-blueAltB.png is renamed to become the default image: sku12345_toySlide-blueAltB.default.png.
After you have set a default image, go to the next step in setting up image-product mapping for the website.