By default WooCommerce will only swap the main variation image when you select a product variation, not the gallery images below it.
This extension allows visitors to your online store to be able to swap different gallery images when they select a product variation. Adding this feature will let visitors see different images of a product variation all in the same colour and style.
This extension will allow the use of multiple images per variation, and simplifies it! How? Instead of uploading one image per variation, upload all the variation images to the product gallery and for each image choose the corresponding slug of the variation on the drop down. As quick and simple as that!