How to save and reload the user login state of a mobile client app of RAD server in Delphi?

Question

I'm writing a mobile client app of RAD server using Delphi 11.1. I'm using TBackendAuth to do user login. Both login and logout work well.

However, I found that every time the app is closed, the state of the user login will be lost. The user needs to log in again if the app is opened again, unless the user is careful not to close but just put the app in the background.

In real-life situations, it's just too easy to close a mobile app either intentionally or accidentally. The frequent login behavior makes the app almost not usable practically.

But remembering user login state is just a very common feature of many different apps on the market such that there is no need to re-login unnecessarily. So can any experts please help me understand how to save and reload the login state in a client app with respect to RAD Server?