I use OwnCloud, which was forked into NextCloud ages ago. I originally intended it as a temporary measure, but it has turned out to be a very reliable, no-frills but adequately featured fileserver. For example, it has file versioning, and companion apps on major OSs that help with managing local and cloud stored files.

If you want a dead simple option, CopyParty is amazing. It's a 1MB Python file that is basically a Swiss Army knife of file hosting. FTP, web interface, WebDAV, SMB, etc., etc. It wont have system integrations or file versioning, but it's impressive what it can do.

Edit: worth mentioning CopyParty has an in-browser media player, which is perfectly adequate for previews.