Not able to upload contact picture via api

Hi all

I while ago I am sure I could upload a contacts picture using the following endpoint

/rest/v11/Contacts/{{ID}}/file/picture and send this as a post request.

I am now getting the following error pack from sugarcrm when I send a file with postman

{
    "error": "missing_parameter",
    "error_message": "Incorrect field name for attachement: picture"
}

Nothing has changed in my file upload code so does anyone know if the api has changed

	public static function postFile($module, $id, $filepath, $filename = '', $mime = '', $field = '') 
	{
		self::connect_sugarcrm();

		$field = (!$field) ? 'filename' : $field;

		$url = "{$module}/{$id}/file/{$field}";
		$file_arguments = array(
			"format" 			=> "sugar-html-json",
			"delete_if_fails" 	=> true,
			"oauth_token" 		=> self::$tokens->access_token,
		);
		$file_arguments[$field] = new CURLFILE($filepath, $mime, $filename);

		$curl = curl_init(self::$SUGARENDPOINTURI.self::$API.$url);
		curl_setopt($curl, CURLOPT_HEADER, false);
		curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($curl, CURLOPT_POST, true);
		curl_setopt($curl, CURLOPT_POSTFIELDS, $file_arguments);
		curl_setopt($curl, CURLOPT_HTTPHEADER, array(
				"Authorization: Bearer",
				"OAuth-Token: ".self::$tokens->access_token,
				"Content-Type: multipart/form-data;",
			)
		);

		$json_response = curl_exec($curl);
		$status = curl_getinfo($curl, CURLINFO_HTTP_CODE);
		curl_close($curl);

		return $json_response;
	}