Flysystem SFTP ( Notes on Remote File Storage for Drupal CMS)

https://www.drupal.org/project/flysystem_sftp

Provides an SFTP plugin for Flysystem.  Useful when setting up a custom Media type that can be stored on a remote system. (Remote Linux).

This is a quick proof of concept showing how Drupal Media files can be configured to use a remote file system. Flysystem SFTP can provide a mechanism for low-budget Content Delivery Network (CDN) for Drupal media. This is a helpful tool if you need to proxy Intranet media through Rich Text HTML email.
 

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The connection string for the remote file service is kep in Drupal's site settings.php file.
 

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# sites/default/settings.php 
$schemes = [
 'cdnsftp' => [
   'driver' => 'sftp',
   'config' => [
     'host' => '',
     'username' => '',
     'password' => '',
     'port' => 22,
     'root' => '/images/',
   ],
   'public' => TRUE,
 ],
]; 
$settings['flysystem'] = $schemes;