gistfile1.txt

function __construct() {

	parent::__construct( awsAccessKey, awsSecretKey );

	$settings = get_option( 'op5dwnl_settings' );
	$this->buckets = ( isset( $settings['buckets'] ) ) ? $settings['buckets'] : false;

	add_filter( 'acf/load_field/name=amazon_s3_file', array( $this, 'acf_load_field' ) );

}
		
public function acf_load_field( $field ) {
	$field['choices'] = array(
		'Colors' => array(
			'red' => 'Red',
			'blue' => 'Blue'
		),
		'Shades' => array(
			'black' => 'Black',
			'white' => 'White'
		),
	);
	return $field;
}