Please check the following steps:
1. Check the capacity of the memory card that your device supports.
Depending on the host device, the capacity of the memory card that can be supported is limited. Check if your host device supports the capacity of the memory card.
2. Check if your host device supports SDHC/SDXC.
SDHC/SDXC standard SD memory cards cannot be used with devices that do not support SDHC/SDXC. Please check if your host device supports SDHC/SDXC.
3. Have you formatted the SD memory card on the device you are using?
If you formatted on a different device, reformat it on the host device you are trying to use.
4. Check the operation on other devices.
If the memory card can be recognized by other devices, please check how to use the memory card with your device.