App Setup is a set of configuration options that are created by the app developer and vary from app to app.
For example, an App may have minimum device restrictions, or certain text fields that can be changed, or styling options with colour pickers. Since every app has its own App Setup, we cover only the general setup principles here.
Every time you save your App Setup, it generates a JSON file which contains all settings. You can export that file and then import it into another project. For example if you have a Staging and Production Project.
Note that both Projects must have the same version number or there could be errors with your import.