How to Add a Product Page Upsell in Shopify Testament Theme

Testament's upsell block sits inside the product form itself, not further down the page — a shopper sees the suggested add-on right next to the buy button, with a quick-view link if the upsell product has variants.

Steps

1. In your Shopify admin, go to Online Store > Themes and click Customize on Testament.
2. Open a product page and select the Product information section.
3. Click Add block and choose Upsell.
4. Choose the specific product to suggest — this is a manual pairing, not an automatic recommendation.
5. Click Save.

If the upsell product has no variants, the quick-view link automatically becomes a direct add-to-cart button instead — worth knowing so you're not surprised by the behavior changing based on the product you pick.