Which your Elgg version?

Elgg 2.3

The code you mentioned should work.

I assume your custom plugin is not located at the bottom on the Plugins page.
Or you didn't clean the caches.

You can also try overriding this view instead:

Copy from \mod\search\views\default\search\header.php to \mod\my_plugin\views\default\search\header.php

Edit this file:

<?php

if (!elgg_is_admin_logged_in()) {
   return;
}

echo elgg_view('search/search_box', array('class' => 'elgg-search-header'));

Flush the caches is required.

You can use this skeleton plugin for your customizations.

If you mean that people can see a listing of the directories. Than you may have an error in your .htaccess.

It should be disabled: see https://github.com/Elgg/Elgg/blob/1598cc34dfec71bff969563c2c7b070e616bb2a5/install/config/htaccess.dist#L6-L7

Indeed. Fixed now. Thanks.

Use this version https://github.com/hypeJunction/Elgg3-hypeDropzone/archive/refs/tags/6.0.0.zip

I tried it, but unfortunately it does not fix the problem. Do I need to edit any file in files plugin ?

Just tested it and this plugin works very well as is without any modifications.

• Deactivate the existing hypeDropzone plugin.
• Remove this folder /mod/hypeDropzone from your server.
• Run 'Flush the caches'.
• Download https://github.com/hypeJunction/Elgg3-hypeDropzone/archive/refs/tags/6.0.0.zip and unzip it to /mod/hypeDropzone
• Activate plugin
• Go to Files and try to Upload a file