Automatically save photos and videos with OneDrive for Android

The camera roll on your device only uploads to Microsoft OneDrive – it does not sync photos both ways. That means you can delete uploaded photos and videos from your device, and the copies in OneDrive won’t be affected. 

To automatically upload your camera roll to OneDrive

1. In the OneDrive app, tap the Me icon  at the bottom of the app.
2. Tap Settings  then Camera upload.Important: 
   • If the Camera upload toggle is greyed out, that means you need to select an account to upload to first, under Camera upload account.
   • Camera Upload can only be used on one account at a time. If you are also a OneDrive for work or school user, select the appropriate Camera upload account.
3. Set Camera upload to On.
4. To make sure videos automatically upload, turn on Include videos. 

Posted from: https://support.microsoft.com/en-us/office/automatically-save-photos-and-videos-with-onedrive-for-android-66605e54-48b8-4f55-bcff-34159702e344