Upsell Removes Original Product from Cart - How to Fix

Issue Overview
When setting up your first funnel in AppSell, you might notice that adding an upsell offer to the cart removes the original product. This behavior is actually working as intended, depending on your funnel configuration.
Why This Happens
The behavior you're experiencing occurs when you have the "Upsell" option selected for your funnel. This is designed to replace the...