Microsoft Graph API: OneDrive upload-by-path creates files at root, not in-place

PUT /me/drive/root:/{filename}:/content always creates or overwrites a file at the drive root, regardless of where the original file lives. For download-modify-upload workflows (e.g. editing a PowerPoint in a subfolder), this silently creates a duplicate at root instead of updating the original. Use PUT /me/drive/items/{item-id}/content to update a file in place by its ID.

When updating an existing OneDrive file's content, use the item ID endpoint (/me/drive/items/{id}/content) rather than the path-based endpoint (/me/drive/root:/{path}:/content).