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> Clicking seems to advance or retreat somewhat randomly

It depends on which half of the slide you click.

I thought it was a video and that I couldn't find the play button at first. Then I looked for a transcript and couldn't find that either. Finally I thought maybe it was an audio player with a slideshow that follows along.

When I realized it was just a slideshow, I was disappointed. Slides are meant to highlight points, illustrate concepts, and provide focus during a presentation, but they aren't meant to replace it. The only purpose in sharing slides is so that the folks who saw the presentation can remember it better.

I found it pretty easy to use the left and right arrow keys, assuming you have a keyboard available to you.

Yeah, I was using an iPad (new), and the presentation was approximately thumb-sized, so left/right of the presentation made less sense to me.

There's a link to download the PDF on the bar on the right.