# Create the Attachable object
        attachable = Attachable()
        attachable.FileName = "thumbnail.jpg"
        attachable.ContentType = "image/jpeg"  # Assuming JPEG format
        attachable._FilePath = temp_file_path  # Provide the temporary file path

        # Link the Attachable to the Item
        attachable.AttachableRef = [
            {
                "EntityRef": Ref(value=item_id, type="Item"),
                "IncludeOnSend": False,
            }
        ]

        # Save the attachment
        attachable.save(qb=qb_client)