To display app embeds, you’ll need to add the app block directly into your product page layout.
Step-by-Step:
From Shopify admin, go to Online Store > Themes
Click Customize next to the Atlas Theme
Use the dropdown at the top to go to Products > Default Product
In the left sidebar, scroll to your Product Information section
Click Add Block
Choose your app block you want to add
Click Save and your bundle offer will now appear live on your product page