You can connect Workspace to your own file system using WebDav. When this is configured it is advised to secure the WebDav configuration.
In this article you will find the link to the Workspace article to accomplish this. We provided information regarding the IP-Address whitelisting section with the information in this article.
Workspace public IP-addresses:
Please use the article from Workspace to configure WebDav security for which you can use the IP-address information as shown in the 'Prerequisites':