What is a method to create a reference file from a new or unclaimed video?

To create a reference file from a new or unclaimed video, you must claim the video and enable Content ID matches. This action registers the video's content with Content ID, allowing it to be used as a reference for identifying matching content on YouTube. Selecting a usage policy determines how Content ID matches are handled, but doesn't create the reference file itself. Partner-uploaded videos do not automatically become references; they must be explicitly claimed and have Content ID matching enabled. Changing a video's privacy setting affects its visibility, not its status as a Content ID reference.