Apple Releases Third macOS Sierra 10.12.1 Beta for Public Beta TestersApple today seeded the third beta of an upcoming 
macOS Sierra 10.12.1 update to public beta testers, one week after seeding the 
second public beta and one day after seeding the 
third beta to developers. It's been two weeks since Apple 
released macOS Sierra to the public.
Beta testers who have signed up for Apple's beta testing program will receive the 10.12.1 macOS Sierra beta through the Software Update mechanism in the 
Mac App Store.
Those who want to be a part of Apple's beta testing program can sign up to participate through the 
beta testing website, which gives users access to both iOS and macOS Sierra betas. Betas should not be installed on a primary machine due to the potential for instability.
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macOS Sierra 10.12.1 appears to focus mainly on bug fixes and performance improvements to address issues that have surfaced up since macOS Sierra was first released. It also includes album support in Photos for the new Portrait feature in 
iOS 10 on the 
iPhone 7 Plus.
macOS Sierra is a major operating system update that introduces features like 
Siri support, cross device copy paste, improved 
iCloud functionality, the ability to unlock a Mac with the Apple Watch, an Optimize Storage option, and more.
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macOS Sierra </div>
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Apple Releases Third macOS Sierra 10.12.1 Beta for Public Beta Testers