Ionic + Firebase Authentication Persistence

Hi everyone,

I have made an app with ionic email authentication. I packaged the app using ‘ionic package build android’. The APK I downloaded afterwards, I uploaded it to TestFairy for installing it on my phone just to test it out.

Every time I close the app the task manager, I have to log on every time.
How can I allow user authentication persistence so that users don’t have to log in every time they open the app?

Thanks in advance.