Wordpress - Manage Your Media Only in admin

gistfile1.txt

add_filter( 'ajax_query_attachments_args', 'show_current_user_attachments' );

function show_current_user_attachments( $query ) {
    $user_id = get_current_user_id();
    if ( $user_id ) {
        $query['author'] = $user_id;
    }
    return $query;
}