Someone recently asked me to help transfer their Whatsapp chat history from their old phone (Sony Xperia Z5, a very old phone now) to their new phone, a Samsung Galaxy S23 FE. I used the QR code method and during this process for some reason the chats completely disappeared from the old phone, the chats were not backed up anywhere and I have no idea how to get the chats back or where they are stored on the old phone, please can someone help?