There are several methods of uploading files, and some methods may work better than others under certain circumstances.
You can upload an unregistered file to your personal container. For more information on uploading and registering a file from your personal container, click here.
You can also use the add new item dialog.
All uploads via any method need to be completed within the time-out limit of 60 minutes. In addition, the maximum file size accepted by the server is 2GB.