MacOS - menu bar tool for syncing files to server

We're running a server that hosts video files. To make uploads and downloads more convenient for our users, we need a small helper tool for macOS. That tool (a small icon in the menu bar) connects to our server (login via username / password / 2FA), then offers two options: 1) select / create a local watch folder, that is then synced to a destination on our server 2) select 1 or multiple projects / folders on our server, which are then downloaded More Infos - Objective-C / Swift - access to our server happens through an API - uploads / downloads must be resumable - folder structure of uploads / downloads must be preserved