Valera Satsura

By default in WordPress admin media library users not has ability to search media items by attached page or post. 
Now you have it! Just enter assigned page title and click search!

Media Search

Search media library items by assigned post or page

This plugin will allow you to attach a single file to multiple posts, but will also will allow you to detach any file.
<ul>
<li>Support http://xparkmedia.com/plugins/file-un-attach/</li>
<li>Languages http://xparkmedia.com/plugins/file-un-attach/#languages</li>
</ul>

File Un-Attach

This plugin will allow you to attach a single file to multiple posts, but will also will allow you to detach any file.

Media Search vs File Un-Attach