MediaSync Lite is a very lean, powerful and simple uploader.
MediaSync Lite is a very lean, powerful and simple uploader for Windows, Mac and also Linux
(however the Linux version lacks some of the features of Windows and Mac version).
It is configurable to upload 1 - 6 files at the same time and skips files already
in your library so you can run it over and over without duplicates.
It also creates a debugging log which you can examine to troubleshoot any problems.