How do you install playground books on iPad? I found a playground book from Apple online called "Talking To The Live View". It's an updated playground from the 2016 WWDC. I want to install it on my iPad and try it out. Further, I want to experiment with building my own playground books and installing them on my iPad.

I'm a licensed iOS developer, and know how to install apps on iOS devices, but despite searching for a couple of hours I have not been able to figure out how to install playground books onto my iPad other than the ones that magically get listed from Apple.
Ok, it turns out that if you use AirDrop to send the Playground book to yourself, iOS offers to open it in the Swift Playgrounds app.