Cross-Selling a Product in Your Store...Button Issue

I followed the Velo Tutorial: Cross-Selling a Product in Your Store with Velo by Wix tutorial. The issue is my “ADD TO CART” button does nothing. I believe I followed the instructions correctly.
Any ideas?

The product in question has to be “seen” on your online store. This is bothersome since WIX does not have a way for a ‘downsell’ or discounted item at checkout. I thought this would be the fix but I cannot have a “downsell” item seen in the store.

Hello, I’m having the same issue as Rob described - after adding all the code exactly from the Cross-Selling a Product in Your Store with Velo by Wix tutorial, the “add to cart” button does not do anything. I have made my product visible on my online store and it’s still not working. Any other suggestions out there? Thank you so much!