Keynote Remote Control from Apple Watch

Noticed an update of considerable size, with mention of the Apple Watch.

So I loaded the update, created a quick 3-slide presentation and then opened Keynote from Apple Watch.

OK, yeah, yeah, got that.  Clicked continue:

It won't launch the presentation from the watch (expected) so I lit up the test presentation from my iPhone.

If you advance the slide at this point, getting to a previous slide is tricky.  Go to the next slide.

 Now do a long press.

Then hit the back key.  This gives you forward-backward capability.

I was then able to page through the presentation, controlling it from the watch.