Scenario

I would like to change the images on my Amazon listings in bulk, is this possible? 

Solution

It is possible to adjust images via extended properties or add more images to listings in bulk by using the Listing Adjustment option.

Single listing adjustment:

It is possible to select images for a listing by specifying image URLs in extended properties (AMAZON_IMAGE1, AMAZON_IMAGE2 etc). AMAZON_IMAGE1 is the main image. Depending on the Amazon Category, listing can have one main image and 5 to 8 additional images.

Variation listing adjustment:

Image URLs have to be specified in extended properties as AMAZON_VARIATION_IMAGE1, AMAZON_VARIATION_IMAGE2 etc. AMAZON_VARIATION_IMAGE1 is the main image of the variation. Each variation has its own main image. Depending on the Amazon category, each variation item can have 5 to 8 images in addition to the main item.

Outcome

Amazon listings will be updated referencing the image URL's from the extended properties