Optional flag that enforces the Content-Type header when uploading the file via the generated pre-signed URL.
If enabled and a MIME type is defined for the file (File.Type.MimeType),
the generated upload URL will require the client to use the same Content-Type header.
Upload requests with a different or missing Content-Type will be rejected by the storage provider.
Note: This does not validate the actual file content. It only enforces the HTTP header used during upload.
Defaults to false. This will default to true in a future API version.