I created a new Hello World watch-only app in XCode 12.4. I have my iPhone connected via USB cable. I can see the "Hello, World" preview on the right side of XCode. I click the "Preview on device" button in the simulator, and that turns blue. When I click the "Live Preview" button, that turns blue, and there's no error message. I expect to see the Hello World screen pop up on my physical watch, but nothing happens. What should happen when clicking the live preview button? Obviously, I'm very new to XCode, so if you have suggestions on what to try, please be detailed about where to find them in the user interface.