Huawei Mate 8 - Manual (Page 59)

Getting to know your phone
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Using the screenshot shortcut switch
Open the notification panel, and then touch in the Shortcuts tab to take a
screenshot.
Using your knuckle to take a screenshot
You can use your knuckle to take a screenshot of the whole screen, or part of it. For more
information, refer to Knuckle screenshots .
Touch Share when viewing a screenshot to share it with your friends.