Come creare un passaggio aggiuntivo di registrazione? L'utente deve caricare un'immagine durante la registrazione prima di essere approvato per navigare o pubblicare

I have setup a private community for a particular software that is in widespread use.
However, I want only the administrators of the software to be able to sign up (not users).

So I would like to ask the administrators to upload an image of the software showing their administrator privileges in order for me to approve them to be able to browse or post a topic.

Any suggestion as to how to implement this?

This plugin can help