Huawei MATE 9 Use Manual page 55

Audio will also be recorded, so make sure that you are in a quiet environment.
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Recording will stop automatically when you make or receive a call.
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When making a screen recording, you will not be able to use the recording feature in other
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applications.
Longer recordings will take up more space on your phone's internal storage, so ensure
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there is enough space before recording.
You can stop a screen recording in three ways:
Knock the screen twice with two knuckles
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Press the volume up and power buttons simultaneously.
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Touch the screen recording icon in the upper left corner of the status bar.
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Viewing, sharing, and deleting screen recordings
Viewing screen recordings
Go to the Screenshots or Screen recordings folders in
Screen and Display
Gallery to view screen recordings.
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