So wait.
You’ve created a bunch of slides with images and embedded video/audio and you want to save the entire deck as a video as if you were clicking the button to progress through the deck?
Does the audio sound good when you run the video within PowerPoint?
Well, at this point I've only created test slideshows and converted them to video. I won't start doing the actual slides until I have the process down pat.
But to answer your question, the idea is to create the slides, record my narration as I move through the slide show, and then have the whole thing saved as video. That way I can distribute the video online (YouTube, for example) and it could be viewed on all kinds of devices just like any YouTube video.