Why isn't the upsell widget displaying correctly on the product page?

The CartMax Product Upsell widget is built based on Shopify's product page block extension. If your store uses multiple product page templates, the current implementation requires you to manually add the CartMax Product Upsell block to each product page template. Only by doing so will the widget display properly across all your product pages, as shown below.

But don’t worry — our technical team is working on a new implementation based on theme-level blocks. With this approach, you’ll only need to add the block once at the theme level, and it will automatically apply across all relevant product templates. Just like the current method, the theme-level block is built using Shopify’s theme extension, ensuring safety, clean removal, and no leftover code when uninstalled.

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