Should I start by exporting the prototype as a “mac app”?
To add a prototype to a Keynote file, the only way I can think of is by exporting a .gif or a video file and including those into the presentation, I’m afraid the Mac app export option doesn’t exist anymore unless you are using an old Principle version.
Just renewed my Principle license. I have Version 6.11 (6013). Mac app export still exist.
Oh I thought it was completely removed!
In any case, exporting as Mac app will only generate a standalone application, doubt that can be added to Keynote.