I’m using the latest version of WooCommerce and the Canvas theme.
In my shop I have a Product which has one main image and underneath three smaller thumbnails.
There are a couple of problems, firstly when I click on the thumbnails they do not replace the main image, instead they open in the lightbox, I also can’t work out how to get the three thumbnails on the same row, for some reason two are on the top row and the third is underneath. I have checked and all the images are the same size, there is also enough space under the main image for the three thumbnails (even four) to fit on one row.
1) Yep by default that is how product gallerys work in woocommerce. If you use product variations then you can swap out the image. They may be an extension that does what you want, but im not sure of one.