VeXell

Simple attachment widget that uses native WordPress upload manager to add files link widgets to your site.
<ul>
<li>Title and Description</li>
<li>Attach Existing Files</li>
<li>Upload New files</li>
<li>Sort files</li>
</ul>
<h3>Documentation</h3>
Press “Add attachment” button. Upload or choose exists file. Add title or description for file. Press “Insert Into Widget”. 
To remove attachment press “x” link.
At any post or page you can use shortcode [widget_attachments] to display widget content. 
Available params: 
 id – Widget ID (You can see at widget) 
 limit – How many items can be showed
Example: [widget_attachments id=”3″ limit=5] It will show 5 attached files from Widget ID equal 3;

Attach Files Widget

Simple attachment widget that uses native Wordpress upload manager to add files link widgets to your site.

evlos

A WordPress plugin which able to sync attachments to multiple FTP targets. And all the documents can be found after install it.

WP-MultiTarget-Uploads-Sync-Tool

A WordPress plugin which able to sync attachments to multiple FTP targets.

Attach Files Widget vs WP-MultiTarget-Uploads-Sync-Tool