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Is there some code that when a different colour is selected (i.e. different from the image displayed), the cart page can display a thumbnail of the colour selected from the colour dropdown box
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That is the deault behavior for version 4.1.x
In your variant setup, and an image per variant.
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and the product description gets updated
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That is not default -- if you need a different product description per variant, you will need some custom code.
BUT -- if you sell shoes, and the "only" difference in the variant is the color, wouldn't a unique product image be sufficient? I guess what I'm saying, if the variant requires a unique description, it's not really a variant, is it?
Try adding variant images.