WhatsApp, a proprietary messaging app owned by Facebook, will introduce a new feature that will allow the migration of chat history between iOS and Android mobile operating systems in future updates.
An announcement was made on a website, WABetaInfo, regarding the multi-device feature, which points to the possibility of migrating chat history to a different WhatsApp platform in future updates.
It will allow you to use one WhatsApp account on multiple devices at the same time.
This feature’s development takes a long time as it will completely change the experience on WhatsApp, and things rewrite to suit multi-devices.
This feature will initially allow you to use the WhatsApp web (including the portal) without a device or internet connection. In a future update, WhatsApp will allow the addition of more iOS and Android mobile devices.
It is well known that future updates for iOS and Android will provide a solution to this problem and allow migrating your chat history. The website also provides a screenshot of a possible update showing the option to migrate WhatsApp chats from iOS to Android.

The post says that it is clear that WhatsApp will also reverse.
When a user tries to associate a device with their WhatsApp account with a different operating system, it is always essential to update to the latest WhatsApp updates available on the App Store or TestFlight to avoid compatibility errors the Android version.
However, a release date for this feature is not yet available.
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However, some web tools allow the migration of chat history; they do not recommend it. For modified versions of WhatsApp, such devices do not permit because they meet the messaging app’s terms of service.