Gordon has made the switch to the iPhone and wants to know how to get his old WhatsApp messages back on his iPhone. Leo says that it was smart that Gordon backed it up to Google Drive, but WhatsApp says it depends on the phone being used. Since you recover chats from iCloud, Leo has a hunch it's not cross platform. Apple is very strict on how users can access data within the iPhone platform, but it's usually app centric.
Since Gordon backed them up, he can at least access them from Google Drive.