Failure to use Native USB

I bought Arduino Due recently.
I used a serial test code. I could upload the code though native USB and programming USB, while native USB is slow!!
I could get feedback data when I plug in the programming USB, even when I upload the data though the native USB.
However, I could not get any feedback from the native USB port.

I didn't use any external power supply for the board, only the USB.
Does anyone have this experience?
Thank you

Search for SerialUSB on this page. https://wiki-content.arduino.cc/en/Guide/ArduinoDue

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