Two iPhones Photos to shared OneDrive

That is not supported as a single automatic camera upload target from two iPhones into one shared OneDrive photo destination.

For OneDrive on iOS, Camera Upload uploads the device camera roll to the signed-in OneDrive account, and you can only upload your camera roll to one account at a time on that device. It is a one-way upload from the phone to that account’s OneDrive.

A supported way to get both phones’ photos into the same place is:

1. On each iPhone, install and sign in to the same OneDrive account.
2. In the OneDrive app, tap the account image.
3. Go to Settings > Camera Upload.
4. Turn on Camera Upload.
5. Turn on Include Videos if needed.

Important limitations:

• Each iPhone can auto-upload only to one OneDrive account at a time.
• The upload goes to the OneDrive account, not to a shared folder as a separate camera-upload target.
• Photos uploaded from the phone remain in OneDrive even if deleted from the device later.

If the goal is for both people to contribute while keeping separate accounts, the available iOS guidance here only supports manual upload for additional files or photos using the OneDrive app.

• Automatically save photos and videos with OneDrive on iOS
• Manually upload files or photos to OneDrive in iOS
• Share files in OneDrive for iOS