Seeing "Waiting for this message. This may take a while."

At times, you might see the above message in place of what you were sent from a contact. Due to end-to-end encryption, you might need to wait for someone's message to arrive because their phone needs to come online. This can happen if you or the person you're chatting with recently reinstalled WhatsApp or are on an older version.
To speed up this process:
For more information on end-to-end encryption, please read our white paper and this article.
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