In the Content Manager, you can upload custom training content using file formats such as PowerPoint, Video, Word, PDF, etc.
We currently support the following HTML5 video media types or formats: MP4, WebM & Ogg.
Similarly, we support audio file types such as MP3, Wav & Ogg.
See also http://www.w3schools.com/html/html5_video.asp for more information about supported file formats and corresponding browsers.
Article: Using the Content Manager