Phil Lehmann

This plugin is made for:
<ul>
<li>Search through all fields in Media Library, including: ID, title, caption, alternative text and description.</li>
<li>Search Taxonomies for Media, include the name, slug and description fields.</li>
<li>Search media file name.</li>
<li>Use shortcode <code>[msp-search-form]</code> to insert a media search form in posts and template files. It will search for media by all fields mentioned above.</li>
</ul>

Media Search Plus

Search through all fields in Media Library to actually find something.

Samuel Aguilera

There are three possible scenarios where this plugin does something. In all cases, the attachment page must exists, the plugin will not run for deleted attachments:
A) A visitor lands on an attachment page and the parent post is available (not in trash or deleted). A 301 redirect will be issued to redirect the visitor to the parent post.
B) A visitor lands on an attachment page and the parent post was already deleted from trash. A 302 redirect is issued to home page (this can be changed to 301 if you want, see FAQ for more details).
C) A visitor lands on an attachment page and the parent post is in trash, therefore not available for the visitor. It returns a 404 error code to prevent endless redirection loop in old WP releases and redirecting to trashed/not available posts.
There is no options page, simply activate it and will do the job.
If you’re happy with the plugin <a href="https://wordpress.org/support/plugin/attachment-pages-redirect/reviews/?filter=5" rel="ugc">please don’t forget to give it a good rating</a>, it will motivate me to keep sharing and improving this plugin (and others).
<h4>Requirements</h4>
<ul>
<li>WordPress 4.8 or higher.</li>
</ul>

Attachment Pages Redirect

Redirect attachment pages or return a 404 error for them based on the parent post status.

Media Search Plus vs Attachment Pages Redirect