Rich media is one of the web edition's great advantages. It is also an easy way to damage readability, accessibility and performance. Each item needs a purpose, caption, credit and appropriate format.
Attach media to meaning
Media should be anchored to a section, not a simulated page number. That allows it to move naturally with the surrounding text across screen sizes and future revisions.
Make it accessible
Images require useful alternative text. Video needs captions or a transcript. Credits and rights information should travel with the asset.