App to drag a product onto a product

Leo38
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Hello,

 

Apologies if this isn't the correct method of explaining my question.  But thought if would be easier to shop what I am looking for rather than explain. 

What app is used to drag one product onto another product, like this shopify store?

https://freshhoney.co/collections/customize/products/jolie-backpack?variant=40127680348317

 

Thanks in advance

Leo

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