We have worked on a Shopify app that has both app bridge embedded which can be used on the admin panel on the left side, and as well, some extensions both app blocks and app embedded.
We have arrived to at a good point in development, testing within development store went very well and we wish to try the app on a production store even if the app is currently in development (not listed, neither approved). So, the chosen distribution method is Custom app for a targeted customer store.
After installation, we could find the app bridge embedded part working but NO app extensions, when accessing the theme customization there were no app extensions.
Is it possible to install app extensions in development using custom apps?