Access pynq over wifi, want to transfer.bit and.tcl files to overlay.But it says, "you need permission to do this."

Access pynq over wifi, want to transfer.bit and.tcl files to overlay.But it says, "you need permission to do this."Maybe visited the board before?It didn’t ask me for a username and password

Problem solved. I tried to set the “overlays” on Linux to be read-write to all users.(“sudo chmod 777 overlays” in “xilinx\pynq”)