Along with a new cumulative update for Insiders on the Windows 10 spring update, Microsoft also released a new Redstone 4 build for Windows Server, bringing the build number to 17639.
Build 17639 RSS
A new feature to take screen clips is coming to the Action Center in the Redstone 5 update to Windows 10. It should be available in an upcoming Insider Preview build in the Fast ring.
Microsoft released Windows 10 Insider Preview build 17639 to Skip Ahead today, and along with a bunch of new features, there's also a long list of fixes, improvements, and known issues.
Microsoft released the latest Redstone 5 build today to Insiders that chose the Skip Ahead option on the Fast ring. Windows 10 Insider Preview build 17639 contains Sets improvements and more.