Please make sure that for both offers and triggers:
1. The products you used in the upsell offers are currently in your products catalog
2. The products you used have a price
3. The products you used are in stock
4. The products you used are active and published
Struggling with your post purchase offer preview?
Unlike other funnel types, the post purchase offer view is rendered by Shopify.
It will automatically inherit your checkout page colors, fonts and elements.
Here are some more details:https://shopify.dev/apps/checkout/post-purchase/ux-guidelines-post-purchase-offers
To see what the post purchase looks like in your storefront, please place a test order with a credit card.
The app isn't working as expected? > let us know.