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Popup after successful add to cart action

Hello

I am trying to create a popup to upsell my visitors after they have successfully added a product to their cart.

it all works great until the product has variations that the client has to choose before the product can be added to their cart.

My modal is set to open on checkout button click, and this opens the modal regardless whether the variation was selected or not.

Question: how can I get the popup modal to only show when the product has been successfully added to the cart?