A. 1. Check SD card compatibility: Ensure that the SD card is compatible with the camera. Refer to the user manual for supported formats and sizes.
2. Reinsert the SD card: Power off the camera, remove the SD card, and reinsert it securely. Then power the camera back on.
3. Format the SD card: If the card is new or has been used in another device, format it using the camera's settings or a computer to ensure it is recognized.
B. 4. Test with another SD card: If possible, try using a different SD card to determine if the issue is with the card or the camera.