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The app may not be working for the following reasons:
To use the app, you need to subscribe to the Light Plan.
Note: Development stores also need to subscribe to the Light Plan.
In such cases, please check in the live environment. Product previews can only confirm the state at the time the preview button is pressed. Therefore, please be aware that refreshing the browser after making changes will not reflect those changes on the preview page.
If this is the case, please access the theme editor of your Shopify theme, enable the embedded app, and check again.
If this is the case, please check the status of the relevant rule from the product quantity rules screen. If the status is "Inactive," please change it to "Active" and check again.
In such cases, please link the relevant product to the product quantity rule, or link the collection that includes the product.
If you want to enforce quantity limits on products under a collection, the collection itself needs to be published. Please publish the relevant collection and check again.
Due to the caching function in Shopify itself, updates may take time to reflect. Please wait for a while and then check again.
If checkout.liquid is customized, you cannot use this store as it is not compatible with the Shopify Functions it uses.
Reference link:https://help.shopify.com/manual/checkout-settings/checkout-extensibility/checkout-upgrade
If the issue is still not resolved, please contact us through the inquiry form or via the app's web chat.