Teamwork Document Editor allows you to download, open, edit, and save changes to files stored within Teamwork Projects, without having to upload them again manually.
Once a Teamwork Projects user with editing permissions clicks to edit a file, the tool will download it automatically and open the file on your Mac. From there, you can make whatever edits are necessary to the file. Then, you just need to press Save and the edited file is automatically uploaded as a new version. All previous versions will still be available in the Versions area of your site.