Apple has released iOS 11.4 for the iPhone, iPad, and iPod touch, adding the long-awaited support for Messages in iCloud and AirPlay 2. Messages in iCloud allows users to store and sync their Messages across multiple devices via iCloud, a feature which was initially promised in iOS 11, and made an appearance in the iOS 11.3 betas before being pulled from the final release. The update also includes support for AirPlay 2, which allows audio streaming…