How to change your WhatsApp wallpaper for specific chats or all chats at once

A little-known feature of WhatsApp is the ability to change the background of your chats.
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You can change your WhatsApp wallpaper for a specific chat or for all of your chats at once.
To change your WhatsApp wallpaper on iPhone or Android, go to Settings or the "Group Info" section of a specific chat.
WhatsApp lets you choose from pre-set wallpapers or upload a photo from your phone.
This story is part of Insider's Guide to WhatsApp.
WhatsApp offers its users the ability