Yes! We highly recommend that you use SFTP to transfer your project’s main audiovisual files. It's safe and allows you to upload large files as well as files in bulk (e.g. if you’re uploading more than one film/content item). Also, if your connection is interrupted or if you have to stop the upload at some point, it will simply resume again once you re-connect, with no need to start the process all over again.
The in-browser file uploading system is good for smaller uploads (only supports images at the moment), but is not 100% perfect for larger files.