If you add a product to cart (in the website shop) that has variants or options it will show a modal where you can choose from all available options and see additional products you can add to cart.

I want this modal to show for every product even if it has no variants. Simply because its a good way for the customer to type in their quantity they want to order and maybe add some accessoires to their cart in the same step.

I don't know tho where the code is that decides what happens if the add to cart button gets pressed. Anyone has a hint or clue where I can find the function that decides if the modal will be shown or not?