how to solve it for keynote… Open keynote then click File, and go down the menu to “advanced”. Select “change file type”, and the options are “single” or “package” My file after saving to “package”( I chose package, and then saved the file), allowed me to see ‘Show Package Contents’ and then find the various video files i wanted.

How to extract a movie or photo out of a Keynote presentation – updated for Sierra