How to create file-server features with Webmin?

I am running Webmin on Linux Mint 17.3.  I am trying to create a file-server so users on my network can access their own, private folder on the server so they can upload and download files and create folders (kind of a Google Drive). Somehow, I can't do this. Users can access their Webmin account, but don't have any folder to access.  Can anybody tell me on a step-by-step basis on how to create an account where users can upload/download files? Please make sure, if answering, that the solution will be attained through the use of Webmin only and not thorough Linux terminal commands.