@Pseudonym 

Good day,

Sorry for the delay.

May I know the brand & model of the SD card, as well as its storage capacity and format type?---A picture of the card, would be highly appreciated;

How long have you had the camera and when did this issue start?

Are you able to test the camera with a different SD card to check if the SD card slot is not broken or has a bad connection?

By the way, when the APP said, no SD card inserted, if you take out the SD card and put it into the computer, would there be any video files inside?

Thank you very much.