Install the On-Demand VPN on your personal device using the instructions here: Installing/Using Global Protect VPN Client-On Demand Service for Personal Devices
Once you have installed and are connected to the On-Demand VPN go to https://files.salisbury.edu/.
Log in with your SU username and password.
You will now see a list of your available drives.
To download a file for viewing right click on the file and choose download.
To upload a file choose Upload in the top menu. Browse to the file you would like to upload and select Upload.