WhatsApp is planning to add an interesting feature, which will let you send messages to yourself, mainly for the purpose of taking notes and such, via linked devices. Currently, this feature can only be used via a workaround, which unfortunately does not work with the multi-device feature. Here are the details.
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A report by WABetaInfo reveals that WhatsApp is working on a feature that will let you send messages to yourself via any link. Messages sent to your number will also appear on all linked devices to easily continue the conversation on any device.
This is being tested on WhatsApp Desktop beta and a shared screenshot shows what the feature will look like. This is expected to reach WhatsApp for Android and iOS when the linking of a secondary mobile device becomes official, something WhatsApp is also testing. You can check out the screenshot below.
For those who don't know, WhatsApp's multi-device feature shows such chats only on the primary device and the linked devices don't reflect the same. If you are not using multi-device support, you can send yourself a message using the URL "wa.me/91." You can enter your number to start a conversation, which also appears on your smartphone.