Question:

Why are the Reaction buttons not displaying when viewing a presentation from the CRM for iPad Media tab?

Answer:

The Reaction buttons do not display when viewing the presentation from the Media Tab. Select an Account so that the Reaction buttons display. End users also need Read FLS to the Reaction_vod field on the Call2_Key_Message_vod object.

Related Documentation:

CLM Help Documentation: Capturing Reactions to Presentations

Knowledge Article: How to Disable Reaction Buttons for a Key Message in a CRM CLM Presentation