After users log in successfully, login-related data can be stored on the device's disk to restore their login status when the app is launched. To do this, the "shared provinces" plugin is installed and used. Two methods are defined in the OSS model: 'store os' to save data and 'remove os' to delete it. This data is managed by setting a string with a name for the data and using ‘Jason encode’ to process the values. The login process stores the OS data on the disk after a successful login, and the logout process removes it. If the plugin is missing, one should debug and run the build process again to ensure successful data storage post-login.