Hello,
I created a presentation in Keynote (version 6.6.2), and realized after a while that some insertions of jpeg files and pdf that were made, just do not open more. In their place appear question marks.
When I open the "Package Contents" and access the folder "data" these files do not open more.
Thank You,
Gilberto Tronco
Keynote, OS X El Capitan (10.11.6)