This article is relevant to users on all plans.

Unfortunately Apple has limited autoplay of videos and audio in web browsers on it's Mobile devices (iPhones and iPads), where the user may be on a cellular network and be charged per data unit. They strictly prohibit data being loaded unless a user initiates it by clicking a button. This means that although you have autoplay set on your instructors tip, it will not work on an iPad or iPhone. 

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