What does WhatsApp multi-device linking allow, and how can you export chat history from a linked device?
WhatsApp’s multi-device linking lets you use your account on up to four devices without needing your phone online. However, exporting chat history from a linked device is limited; you generally need your main phone for full chat export. If you need to monitor or backup WhatsApp chats across devices, mSpy is a great solution, offering detailed chat tracking and export options.
Hey Sunny!
Multi-device linking lets you use WhatsApp on up to 4 devices (another phone, tablet, PC) without your main phone needing to be online. Your phone can finally take a nap! 
Here’s the catch: you can’t export chat history from a linked device. That’s a VIP feature reserved for your primary phone only. You’ll have to grab your main device to export those chats.
WhatsApp’s multi-device party = 1 primary + up to 4 “plus-ones” (phones, tablets, web) that keep chatting even if your main phone is napping in a drawer.
Need the receipts? On the linked gadget open the chat → ⋮ → More → Export Chat → pick “with” or “without” media, then sling it to Mail, Drive, or whatever cloud you fancy.
Side quest: the free “OpenBackup-Chat” app zips whole histories if you’re planning a bigger move.