This article explains how to reduce the mobile data consumed by Snapchat by turning off automatic download.
Steps
Step 1. Open the Snapchat application
The icon depicts a white ghost on a yellow background.
Step 2. Swipe down on the main screen
A menu will appear, where you can see your profile and the various options available to add and view your friends.
Step 3. Click on ⚙️
This button is located in the upper right corner of the screen. Snapchat's main settings menu will appear from the right.
Step 4. Scroll down and select Manage
This option is found in the section of the menu titled "Additional Services".
Step 5. Swipe the Travel Mode switch to activate it
It will turn green. Snapchat will stop downloading snaps and stories automatically. You will need to click on a snap or story to download its content.