Add Custom input field in media uploader.

add field in media upload

/**
 * Add Photographer Name and URL fields to media uploader
 *
 * @param $form_fields array, fields to include in attachment form
 * @param $post object, attachment record in database
 * 
 * @return $form_fields, modified form fields
 */
function rtp_attachment_field_credit( $form_fields, $post ) {
    $form_fields['rtp-photographer-name'] = array(
        'label' => 'Photographer Name',
        'input' => 'text',
        'value' => get_post_meta( $post->ID, 'rtp_photographer_name', true ),
        'helps' => 'Provided name of photographer',
    );
    
    $form_fields['rtp-photographer-url'] = array(
        'label' => 'Photographer URL',
        'input' => 'text',
        'value' => get_post_meta( $post->ID, 'rtp_photographer_url', true ),
        'helps' => 'If photographer name is present, will link here',
    );
    
    return $form_fields;
}
add_filter( 'attachment_fields_to_edit', 'rtp_attachment_field_credit', 10, 2 );

/**
 * Save values of Photographer Name and URL in media uploader
 *
 * @param $post array, the post data for database
 * @param $attachment array, attachment fields from $_POST form
 * @return $post array, modified post data
 */
function rtp_attachment_field_credit_save( $post, $attachment ) {
    if( isset( $attachment['rtp-photographer-name'] ) )
        update_post_meta( $post['ID'], 'rtp_photographer_name', $attachment['rtp-photographer-name'] );

    if( isset( $attachment['rtp-photographer-url'] ) )
        update_post_meta( $post['ID'], 'rtp_photographer_url', $attachment['rtp-photographer-url'] );

    return $post;
}
add_filter( 'attachment_fields_to_save', 'rtp_attachment_field_credit_save', 10, 2 );