From Indie IT Wiki
To get started with WhatsApp Web...
- Visit web.whatsapp.com on your computer.
- Open WhatsApp on your phone.
- On Android: in the Chats screen > Menu > WhatsApp Web.
- Scan the QR Code on your computer screen from your phone.
- From your phone, navigate to WhatsApp Web to view your logged in computers or to logout from an active WhatsApp Web session.
iPhone - Photos Attachment Folder