This a must to save data else when you get up in the morning you will find that more than half of the data is already consumed when you get up.
The procedure for Whatsapp auto-download of pics and videos is enumerated below with screenshots.
1. Due to increased activity on Whatsapp you. Might be finding your data vanishing if you have not changed settings from Auto Download.
2. The procedure with Screenshot given below:
3. Look for 3 dots top right in the main account and not in group>Settings>data and storage usage>when using mobile data>uncheck all boxes
Same way for wifi
Do remember to get best stock tips on WhatsApp to start making money like professionals.