I've been looking for a pop-up upsell/discount offer App that triggers specifically when, for example, a buyer Add To Carts 1 Qty of a certain product but I have seemingly reached a roadblock.
Kos website does it: https://kos.com/collections/vegan-plant-protein-powder/products/kos-organic-vegan-plant-based-protei...
Looks like theirs was custom coded. An upsell triggers when a customer selects 1-pack (1 Qty).
Any recommendation is appreciated.