The search term you are looking for is "UNC name". Something like this, if the server exposes the path for your credentials:
\\192.168.99.88\xxx\yyy.csv
servers inside your organization usually have names, so maybe
\\zzzserver\xxx\yyy.csv
That's for windows. Mac is different.
Or, you can set it up as a drive letter on your local machine and ignore the UNC name. The UNC name is more portable if you have several machines you might run a script on (because it takes work to make the drive letter mapping be the same on many machines.) The drive letter mapping provides a nice indirection if the data might move from server to server...remap the "z:" drive and scripts that use z: keep working.
Craige