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Download the latest version of WhatsApp from Google PlayStore.
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If you have the app, just update it to the latest version.
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Open WhatsApp.
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Tap on the contact's name you wish to share the video with
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Tap on the attachment or the paper clip icon.
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Record a new video or select Gallery and then the video.
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The video will appear on your screen, and you can alter it from here.
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You will see a small speaker icon right beneath the video frames. Tap on it to mute the video.
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You can press on Send once this is done.
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If you don't see the video icon even after the update, you may have not received it. So just wait for a while