USB gadget can real-time synchronization PC /jetson nano

Hi, when I use usb gadget ,cannot real-time synchronization file between PC and jetson nano.

R32 (release), REVISION: 4.4, GCID: 23942405, BOARD: t210ref, EABI: aarch64, DATE: Fri Oct 16 19:44:43 UTC 2020

tips:
when I change file in win, I must umount /mount in nano ,then I can found the change.
Is there a way to solve this problem?