What is the function of the USB interface on the front of the printer

Q: What is the function of the USB interface on the front of the printer?

A: The function of the USB interface in front:

1）It will be used during factory production debugging/testing

2) If you use a USB flash drive to upgrade firmware, you will need it

3) When connecting the camera to the printer and selecting PictBridge mode for printing, the camera with the function is used,

Camera connection printing: First, users need to have a camera that supports PictBridge function, connect the printer with the camera's built-in connection cable, and then operate on the camera