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Overview

While Upcart includes a built-in preview feature that lets you view the cart on your live theme without publishing it (found in the top-left corner next to Cart Status), there are cases where you may need to test it directly within the theme editor.
Steps to Follow
  1. In the Upcart Cart Editor, ensure your cart is published.
  2. In your Shopify Admin, go to Online Store → Themes.
  3. On your Live Theme, click Customize → App embeds and confirm the Upcart embed is disabled. Save if you made any changes.
  4. On your Draft Theme, click Customize → App embeds, enable the Upcart embed, and click Save.
  5. Click the three-dot menu in the top-left corner of the theme editor and select Preview.
✅ Success! Upcart is now active only on your Draft Theme. Any changes saved in the Upcart Cart Editor will be visible there without affecting your Live Theme. Here’s a quick tutorial walking you through these steps: Shopify Themes page showing the live theme and a draft theme in the library

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Important Notes

  1. As outlined in the Quickstart Guide to Upcart, showing the cart to shoppers takes two parts:
  • Publishing a cart in the Upcart interface.
  • Enabling the Upcart app embed on the theme you want it to appear on.
The two are independent. Publishing a cart doesn’t require the app embed to be on anywhere — a cart can be Live while every theme has the embed off, which the app shows as an App embed off badge. So you do not need to temporarily enable the embed on your live theme first; enabling it on the draft theme alone is enough.
  1. If you have Discounts configured in your cart, those rules will remain active via Shopify’s discount system even when the app embed is disabled.
Disabling the app embed only hides the Upcart cart drawer from your storefront. It does not disable your active Discount rules. Customers will still see Discount adjustments applied at checkout.