Ticket #28774: async-upload-attachment.diff

wp-admin/async-upload.php

@@ -43 +43 @@
         send_nosniff_header();
         nocache_headers();
 
-        wp_ajax_upload_attachment();
+        /** This action is documented in wp-admin/admin-ajax.php */
+        add_action( 'wp_ajax_upload-attachment', 'wp_ajax_upload_attachment', 1 );
+        do_action( 'wp_ajax_upload-attachment' );
         die( '0' );
 }