When you enable the Use Cellular Data option in the app preferences, Lightroom for mobile uses your cellular network's Internet bandwidth to:
- Download an image for editing from the cloud when you open it in the Loupe view.
- Sync any image adjustments or metadata changes to the cloud.
- Upload/ Export any recently added images to the cloud and phone.
However, if a WiFi connection is available on your mobile device, Lightroom for mobile prioritizes the WiFi connection over your cellular network's Internet connection.
Let us know if this helps.