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The AES-GCM-256 key is generated by WhatsApp server at registration time and is sent to the client. Client stores this key in /data/data/com.whatsapp/files/key. Daily chat backups are encrypted with this key. The 256-bit IV and 256-bit Id of the key is stored in msgstore.db.crypt12 itself. The Id is used to identify the key that encrypts the backup.
When a ...
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You need to upload your key to the servers that you want them on, they are owned by different entities and do not synchronise their record. You are looking for the servers in SKS pool (that propagate their data across different servers that GNU GPG tries to read as default). I would upload the key to keys.gnupg.net fo the best visibility.
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