@Clyde D'Souza - Once you are ready to have people test your app, and assuming you were developing locally e.g., http://localhost, once it is deployed somewhere public and you have updated your app link from localhost to the public host, then you would just share the app install link with your testers (there is no requirement for the app to be in the Marketplace before the public can use it).

Here are a few links with info on the subject:

https://developers.miro.com/docs/share-an-app-outside-of-a-developer-team

https://developers.miro.com/docs/deploy-a-miro-app#share-your-app

I am teaching myself React these days and haven't been in a developer role in nearly two decades, so please excuse if I misunderstood what you were asking

That’s perfect - this is exactly what I was looking for. Thanks @Robert Johnson !