A Microsoft file hosting and synchronization service.
Thanks for your reply.
Are you using a work or school account in OneDrive?
Camera Upload is only available for personal accounts. Open OneDrive, tap Me, and check the account type. If it is work or school, photo auto sync will not appear. Use the Photos app, select a photo, tap Share, then Save to OneDrive to upload. If it is a personal account, sign out of OneDrive, restart the iPad, sign in again, and allow all permissions when prompted to restore the Photos options.