Q: Auto sync Sharepoint document library with Dropbox?

I'm looking for module or 3rd-party integration which can do sync between SharePoint Document Library (under Office365) and Dropbox folder? Basically, our clients are using Dropbox (and they share that with us via Dropbox) and we want to auto upload their Dropbox changes into our SharePoint Library.

The updates also need to be uploaded (i.e., if our partner updates the file) and we need to track owners of files.