Add New Field To Attachment #Metabox #CustomMetabox

functions.php

/*
 * Show Image Id on Media Edit
 */
function ibenic_add_media_custom_field( $form_fields, $post ) {
	$form_fields['info_ID'] = array(
		'label' => __( 'Image ID' ),
		'input' => 'html',
		'html'  => "<input type='text' class='text' readonly='readonly' onfocus='this.select();' value='" . esc_attr( $post->ID ) . "' /><br />",
	);
	
	return $form_fields;
}
add_filter( 'attachment_fields_to_edit', 'ibenic_add_media_custom_field', null, 2 );