I know that people will frown at this for being Chinese but I really recommend Seafile: - https://www.seafile.com/en/home/ https://www.seafile.com/en/home/ It

I know that people will frown at this for being Chinese but I really recommend Seafile: - https://www.seafile.com/en/home/ https://www.seafile.com/en/home/ It's pretty much an open-source version of Dropbox. It works incredibly well, you can host it yourself and does what you expect you to do.