Shopify App in Admin not in store

Hello Everyone,

I have a custom Shopify app that is in development. It is currently hosted on Heroku and appears on the Shopify admin page where I (the admin) can check that the functionality works.

However, I can’t seem to figure out how to get the app in the store customizer. (from admin click online store > themes > customize which opens a store customizer).

I am wondering what I still need to include to place the app in a test store to see how it looks.

In partners.shopify as the app owner I can set a distribution link however this cannot be undone. Can I have some guidance on how to get a Shopify app that appears in the admin to appear in the store customizer?

Thanks!