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Make sure you have enabled Gallery folder permissions for OneDrive in your System Settings.
Open Settings on your Android device and go to Installed Apps.
Locate OneDrive and tap Permissions.
Make sure Photos or Gallery is set to Full Access.
If you are still having trouble enabling the Camera Backup function, try uninstalling and reinstalling OneDrive.
During the initial setup, make sure you grant all the necessary permissions, especially the Photos or Gallery folder permissions for OneDrive.