MDO32 not recoginize USB stick after change the save screen capture save path to external IP

We use our tool to communicate with MDO32 oscilloscope, then we configure the screen save path to the external IP address (on my computer), it ok and we can save capture screen on our computer.
But after that, MDO32 oscilloscope does not recognize any USB storage when connect to the front panel of osc. We try to restart oscilloscope, disconnect the tool, format usb, change usb drive… but there is no way for oscilloscope to recognize external usb again.
Pls help me to config the oscilloscope to use USB storage.