Download file

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.