The offline mode allows you to suspend the development of photos in HDR until the mode is deactivated.
This is useful in a case where you don't want to use your cellular data to develop photos and you want to wait until you are on a WiFi network.
To activate/deactivate the offline mode
1) Open the Exposio Rea Estate Camera app
2) Click on the menu button in the upper right corner
3) Click on Settings
4) Activate/deactivate the Offline mode