Propel Upsell & Cross‑sell

I installed this app for a very simple upsell at checkout. At first I found that it created draft orders that strangely allowed ineligible customers to get free shipping if an e-product and actual shippable product were purchased at the same time.

However, I let them know about the issue, and they resolved the it which is great! Now I have a very easy to use and simple (and free!) upselling app that has already helped me make a couple of extra sales. Great app :)