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Preselecting dropdown options in ecommerce site

I’m building a clothing store for a client.

He asked it to work like this

Webflow can’t change a product image unless both options (color & size) are chosen.
Selecting “Preselect default variant” doesn’t seem to work for dropdown boxes.

I’ve selected a variant as default size and color.

Can I build colored radio buttons with Webflow or at least have it pre-select options in the dropdown?