Within the analytics page you can see how each individual pop up is doing, statistics on how many customers add to cart, check out or even abandon cart.
Customers are tracked from the time they view the product to the time they checkout.
Views - The number of customers who view the page/pop up.
Drop Offs - The number of customers who who abandoned cart
Total Cart Upsell Value - The total value of products upsold through the funnel
Total Order Upsell Value - The total value of products that were upsold and checked out through your funnel
Total Abandoned Cart Upsell Value - The total value of products upsold but were abandoned through your funnel