// Prise en charge du gestionnaire de médias natif de WP
add_filter( 'ajax_query_attachments_args', 'wpb_show_current_user_attachments' );
// Prise en charge de l'extension Media Library Assistant
add_filter( 'mla_media_modal_query_final_terms', 'wpb_show_current_user_attachments' );
function wpb_show_current_user_attachments( $query ) {
 $user_id = get_current_user_id();
 if ( $user_id && !current_user_can('activate_plugins') && 
!current_user_can('edit_others_posts') ) 
{
 $query['author'] = $user_id;
 }
 return $query;
}