YY3588 has four USB3.0-YTPEA ports, one full-function TYPE-C port, and two USB2.0 ports (one on the terminal and one on 30pin).
Insert the USB flash drive into any of the four USB3.0 ports of yy3588.
The animated picture is as follows:
Just connect the USB flash drive to the TYPE-C port.
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You can use the external pin as a normal USB2.0 host port.