Connect to the Apps Manager and navigate to the space where you want to mount the drive. Look at the members, and make sure your user has the correct roles:
Then in a console, connect and log into the pcf space (something like cf login and cf -s APPNAME).
Next, try the command cf create-service smb Existing Files_Share -c '{\"share\":\"//server.name.domain.com/Files_Share\"}' (the backslashes are important if you’re on Windows).
Now you can bind the service with cf bind-service APPNAME Files_Share -c '{\"username\":\"username_without_domain\",\"password\":\"network_password\",\"mount\":\"/mnt/Files_Share\"}'
For more info, see https://docs.cloudfoundry.org/devguide/services/using-vol-services.html#smb