I’m here to help you fix your card reader connection.
Did you double-check if the card reader is firmly connected to your computer via the USB port?
You can try turning your card reader on/off by pressing and holding the power button on the side of the device until the green light is visible. If it comes with a charging dock, remove the device from it prior to pressing the power button.
If you continue to get the same result, let’s disconnect the reader and reconnect it. Here’s how:
1. From the upper left menu, select Settings.
2. Select Card Readers, then choose the card reader you want to disconnect.
3. From the Reader Actions drop-down, select Forget Reader.
4. Re-connect the reader.