I've built an app theme extension using the Shopify-app-template-node GitHub template provided by Shopify. In my app, there's a configuration section that merchants can access on their admin site as well as an embedded app extension that the merchant can add to their Shopify storefront theme. My app displays correctly and everything works when I run it locally. I recently deployed the app using Heroku and it is accessible if I try and access it through the partner's Test Your App feature. However, when I tried to test my app out in this environment, I noticed that the CSS doesn't display correctly for the embedded app extension in the storefront theme (The admin configuration section has the style applied appropriately). Why is this? I don't believe the JS is working either. When I click the icon for my app, it's supposed to open a modal, but nothing happens. The HTML elements rendered though
