Bugs in Keynote (ver 9.1, High Sierra OS) in recording the slideshow --- Fix it this simple way
In the beginning of the recording of the slideshow:
- wait pass the '3-2-1-dot' countdown for 5 seconds or longer before turning the mike off ( at the bottom left corner)(if you do not intend to record your voice, and just synchronize your slides with the chosen music file)
Then you will be able to export the key file as 1080p mov/m4v file that can be played in Quicktime or VLC.
Please confirm for me if this works out for you.
iMac Line (2012 and Later)