By default, WhatsApp will automatically download images over your cellular connection to provide you with quick access to your latest photos. Audio and video will automatically download only on Wi-Fi by default.
To configure automatic photo, video or audio downloading, simply go to Settings > Chats and Calls > Media Auto-Download.
Here you can choose when WhatsApp will automatically download each type of media.
Selected media will never automatically download. You will need to manually tap each image or video to download it.
Selected media will automatically download when you are connected to a Wi-Fi hotspot (e.g. your home internet).
Wi-Fi and cellular
Selected media will automatically download whenever you have an Internet connection.
If you have a limited data plan, you may want to restrict media items to auto-download when connected to Wi-Fi only.
WhatsApp Support Team