Timestamped Media Annotation
This screencast demonstrates how to upload a media file (audio, video, or photo) and associate it with a timestamped annotation. Use this to attach a file to a particular instance in the video.
Timestamped Textual Annotation
This screencast demonstrates how to create a textual annotation and associate it with a range in the video that you are editing. Use this to highlight a snippet in the video and attach a comment to it.