Unfortunately, most people and institutions just put their course in a presentation program (Powerpoint, Impress) or convert it to PDF and label it as "online content". But in order to benefit from this new media rich environment offered by elearning, the content must be tailored for it.  The flow is different from a "classical" course and the structure must be tailored to it. Replace physical models with virtual 3D simulations!. Switch  demonstrations with animations. Use interactive material instead of conversational explications. That in order to convey better the message of the course.