To use the feature, you need to record the audio in “hands free” mode. That is, after tapping the microphone icon, you need to swipe up to “lock” the recording. The controls for pausing and listening before sending will appear next.
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Application updates tend to be released piecemeal, so it’s possible that the news may take a few days to show up for everyone.
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See below for ways to send audio messages on WhatsApp:
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How to send a voice message
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How to record handsfree and listen before sending
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