Retrieves and downloads the entire media file based on the specified file ID.

The response body is the raw binary content of the file. Treat the response body as a byte stream and write it directly to disk or pass it to a file handler.

The Content-Type response header indicates the MIME type of the file (e.g. application/pdf, text/html). Use this to determine how to handle or display the file.

The Checksum-SHA256 response header provides a SHA-256 hash of the file contents. Verify this value against the downloaded bytes to confirm the file was not corrupted in transit.