I thought I remember from early on that it was set to stream to a remote location.
But you have to set the device to record or have SIM cards in the cameras to capture it locally. I know that the in-car cameras for racing can produce files larger than 2GB for a 20 minute session and that is not at highest quality. Maybe he was doing both and the statement from the police is correct there was nothing recorded from the cameras but until we know what the cameras were, we won’t know if anything was recorded in them.