Occasionally, some of the network shares will fail to mount automatically on macOS, but you can mount them manually. If you are a student as well as an employee, the share may fail to mount because of permissions; please see the article on Employee vs Student Accounts for more details.
Open Finder
Select Go > Connect to Server
Enter the Server Address
For the GDT Server (what used to be the "S: Drive" or studata): "smb://fs-tech.otc.edu/GDT" (case sensitive)
For Division (the "R: Drive"): "smb://fs-sgf.otc.edu/Division"
Press the plus button to add it to your favorites
Click Connect, then click Connect a second time