To connect to file systems from Windows instances, the NFS Client must first be installed. Be sure to follow the installation procedure found in Mounting File Systems From Windows Instances before proceeding with troubleshooting.
Symptom: The IP address and export path are correctly represented in the Folder field. When you click Finish, the system attempts to connect to the file system, but fails with an error: "The mapped network drive could not be created because the following error has occurred: An unexpected error occurred."
Solution 1: Reboot the instance, and mount the file system again using File Explorer.
Solution 2: Mount the file system using the Command Prompt.