missing video files

Hi all, and thank you for your responses in advance. I have just run a mission in Litchi using the Mavic 2 Pro with a smart controller. All successful with one exception. I landed. Exited the app. Ran a mission using the DJI app. Shut down the controller and shut down the drone in that order...

I had a recent flight where I shot some videos (MP4), but when downloading from the SD card at the end of the day, the MP4 files were NOT there, ALTHOUGH corresponding *.THM files with the correct date/time stamp WERE present. I had no indication of any problem on the display. Seeing that, I...