Microsoft Graph Shares
Microsoft Graph Shares is the part of Microsoft Graph that lets apps access a OneDrive or SharePoint item by its sharing link or token, without needing to know the site, drive, or item IDs. Given a share URL, you can resolve it to a sharedDriveItem and then work with the underlying driveItem or listItem: read metadata, navigate folder children, fetch thumbnails, and download content—and, if the link grants edit rights, make changes.