Add missing file menu in File app

customize.dist/src/less2/include/toolbar.less

@@ -1078,6 +1078,7 @@
         .cp-toolbar-bottom-mid {
             display: flex;
             order: 2;
+            margin: auto;
             button {
                 margin-right: 5px;
             }

www/file/inner.js

@@ -71,6 +71,7 @@ define([
             $container: $bar,
             metadataMgr: metadataMgr,
             pageTitle: Messages.upload_title,
+            addFileMenu: true,
             sfCommon: common,
         };
         var toolbar = APP.toolbar = Toolbar.create(configTb);