Dear Jo,
NetDrive provides a command line interface. Pleas refer to the link below.
https://support.bdrive.com/t/nd3cmd-manual-page/97458/2
You can create a batch file to automate refresh using the command line.
The following is an example of refresh.
echo start batch file
:FOR
nd3cmd refreshpath “F:\download”
timeout 5
@GOTO FOR
Regards.