A Microsoft file hosting and synchronization service.
Hi,
Are you signed in with the same account in both the OneDrive app and iPad settings?
Open the OneDrive app, tap Me, then Settings, and turn on Camera Upload and Photos access. Go to iPad Settings, select Privacy and Security, then Photos, and confirm OneDrive has Full Access. In OneDrive Settings, select Reset OneDrive, then sign in again and keep the app open while connected to Wi Fi and power so sync finishes. Also check Files On Demand is off in OneDrive settings if shown, then try uploading one photo from the Photos app using Share to OneDrive to test.