Applies to :
The Reolink Argus, Argus 2, C1, C1 Pro, C2, Keen.
To begin with, you have to check whether the SD card is recognized by the camera. Then you are able to set the camera to record on SD card following the instructions below.
Turning on the PIR sensor, then go to the PIR settings to enable the record, set the schedule for recording and the sensitivity of motion detection.
Via Reolink App: