Install Flmngr file manager server side
In order to let your Flmngr file manager dialog to list files, upload and modify them on the server, you need to install official server side script to add such support to your server.
Users who use CMS integrations like Drupal already have backend installed and configured. Users of custom integrations (when you install JS snippet or CKEditor or TinyMCE plugin) need to integrate the file manager backend to their CMS or framework manually.
Install the package 
Go into your PHP project and in its root directory, run:
composer require edsdk/flmngr-server-php
if you need more info
If you do not use Composer you can
use a no-Composer archive
And let some URL be a handler. If you do not use any framework, just create a PHP file `flmngr.php` with the following contents:
<?php
EdSDKFlmngrServerFlmngrServer::flmngrRequest(
array(
'dirFiles' => '/var/www/files',
)
);
In frameworks like Laravel, Symphony, Yii, CodeIgniter, etc., you can create a new method in some controller calling the same method. A URL mapped to this method will be the entry point of all Flmngr requests.
Link Flmngr with the server
Using the visual Dashboard, you can specify the URLs of your server to link Flmngr with it.
- File Manager URL is the full URL of
flmngr.php
. - Files URL is the full URL of
dirFiles
(not a directory path!).

Note: Alternatively, you can pass these parameters as Flmngr.urlFileManager and Flmngr.urlFiles parameters into the Flmngr config. This is useful when you need to use different directories based on the current user to support multi-⁠user installations.
Files URL explanation
The Files URL option is the prefix Flmngr will add to any file when inserting it into your content (or returning it into a callback of your API call). If you can use Flmngr fine, but all inserted images are broken, please see this sample to understand how it works:
Flmngr.urlFiles
client-side parameter
http://your-website.com/files/
/var/www/files/
dirFiles
server-side parameter
/path/to/image.png
Multi-user environment
Flmngr can work in applications where you have many users with different storages. You can programmatically specify Flmngr.urlFiles
and dirFiles
parameters synchronously with values based on the current user's session.