- YouTube Security Warning: YouTube streaming video when published to HTML and run locally from your hard drive might display a security warning. The warning is a Flash security warning related specifically to running the video locally from a machine (as opposed to running it from the Web). When your title is published to a Web server, this error will not occur and users of your published title will not see the security warning.
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On mobile devices, only .mp3 audio and .mp4 video file types are supported. Additionally, synchronized events are only supported with .mp3 audio and .mp4 video file types. Synchronized events are actions configured to run at specific times while the media object is playing, like hiding or showing messages or moving a pointer on a diagram. For more information, see Adding and managing the synchronized events of an audio object and Adding and managing the synchronized events of a video object.