SellUp: Add ons & Cart Upsell

I use this app so we can upsell to a customer at checkout. Unfortunately, it does not offer a discount functionality. And I have to look into another app so I can have multiple automatic discounts because Shopify doesn't allow that as a default and this app can't cater to it either. Dan was super helpful, though, getting the app to work correctly after I added it. It doesn't work right out of the box for 2.0 stores, but he had it working, as best as it can, within a couple days. Thanks, Dan!