Before Rubik Variant Images can function on your storefront, you need to activate it on your current theme using Shopify’s App Embed system.

Step-by-step:

1. Open the Rubik Variant Images app.
2. Go to the Activated Themes tab.
3. Select your live or draft theme from the dropdown list.
4. Click Enable on Theme Editor — this will open Shopify’s theme customizer.
5. In the theme editor, go to the App Embeds panel (left sidebar).
6. Toggle Rubik Variant Images to ON and click Save.

Once the embed is active, the app will begin controlling image behavior on your product pages.

💡 Note: You can activate Rubik on multiple themes — great for testing in unpublished versions before going live.