Review your preferences
Open Data and Storage in Settings and Privacy. The screen offers Data saver and Upload on Wi-Fi only. Content preferences includes an autoplay choice. Read the saved result after changing a setting; an error means you should not assume the new preference took effect.
Data saver is intended to reduce automatic media activity in supported screens. It does not make the app offline, stop every request or guarantee a fixed number of megabytes saved. Images, messages, searches and media you deliberately open can still use data.
Decide when to upload
Wi-Fi-only uploads can keep a supported transfer waiting until Wi-Fi is available. If an entry is paused or waiting, inspect the connection and the setting before treating it as an upload failure. The upload guide explains how to distinguish waiting, preparation, transfer and publication.
Turning off autoplay can help you choose when to watch. Existing screens may apply preferences differently, so check actual playback after a change. Pause a playing video yourself if you need to stop immediate data use; do not rely on a setting to undo a download already in progress.
Keep important files safely
Review download and sharing guidance before saving media. Clearing saved data on a phone can affect local material, so retain important originals and read the current confirmation. Language and region preferences are separate from data controls. For an unexpected transfer or a setting that repeatedly fails, contact support with the app, screen and displayed error.