I'm pleased to announce that if you start an outdoor run and outdoor walk, the Watch, together with the iPhone maps your route that you took! You can see this route after you save the workout and view it on the Apple Watch app on your iPhone. I wanted this feature for so long! The route seems to be color coded too with red/yellowish regions on your route, kinda like traffic zones, but I'm not sure what those colors mean.
Oh! Sorry, I misunderstood you, I thought you were asking why the screenshot doesn't work.
Yes, you have to press both the side button and the crown together to pause a workout, just like how you would take a screenshot in watchOS 2.