https://twitter.com/ontouchstart/status/753801598367731712
However, with the .playgroundbook format (folder), it seems that I can only export it to Mac (as a folder) and can not AirDrop back to iPad. And it seems that XCode 8 beta-2 does not support playgroundbook yet.
I am keeping an eye on Apple documentation:
https://developer.apple.com/library/prerelease/content/docum...