Load all apps at once

Step 1. Change the path

In app.json instead of 

"extra": {
      "firebaseMetaPath": "/meta"
    },

Change the firebaseMetaPath to "/apps"

"extra": {
      "firebaseMetaPath": "/apps"
    },

Step 2. Import all apps in /apps

In your filrebase real-time database create new node apps and create some element inside, just to create the node, later will be overwritten. 

Now click on "apps" so you path in firebase is there. 

In the Demo Data folder, you will find  another folder All

Inside there is apps.json

Import that files in Firebase. 

Step 3. Let uni expo know that this is a preview app

In config.js at the end, there is

exports.isPreview=false;

Make it true

Now run your app