Popup in opencart by clicking on the "add to cart" button, how?

Question

opencart

Hello. Tell me where and what to edit so that in opencart3 when you click "buy" a window (popup) is displayed with a suggestion to add 1 more item to the cart?

Answer 1

Tell me where and what to edit so that in opencart3 when you click "buy" a window (popup) is displayed with a suggestion to add

Put the module and edit it.

with an offer to add 1 more product to the cart?

The usual offer is to either go to the order page or continue shopping.
Example:
https://opencart3x.ru/module/order/cart-popup

Answer 2

approximate solution This is a link to the wareznik