If you're prepared to make a few additions to httpd.conf, you can get running with this Python3 technology to do file-sync using Subversion as the backing store. It doesn't require any client-side Subversion install, but does Python and some pips. At least up until I make an installer.
I'll make the usual UI for it in the weeks that follow.
Right now I am hoping to integrate with various other applications/services. Trello, Slack, etc. That would be for workflow-ish functionality.
Say - Fred assigns a spreadsheet to Wilma in Trello by changing the 'assigned to' aspect of a card, and a few seconds later it appears on her C: drive. "Update the day totals", he says. She does, and a bot notices the change in the spreadsheet and updates Authz files to make it effectively disappear from her C: drive (and update in Trello again).
Or maybe that workflow happens in Slack.
Get in touch if you're a corporate and are intrigued.