1. iPhone → OneDrive
The standard route — camera upload in Microsoft's own OneDrive app — works too:
- Install Microsoft OneDrive from the App Store and sign in.
- Open your profile Me, then Settings → Camera upload.
- Turn camera upload on for the Microsoft account where you want photos stored.
- Optional: enable Include videos, Wi‑Fi only, or bedtime-style uploads when offered.
- Leave OneDrive allowed in Background App Refresh (Settings → OneDrive) so uploads continue when the app is not open.
- If you use Optimize iPhone Storage for iCloud Photos, uploads may wait until full‑size files are available — check Apple Photos settings if uploads stall.