Media Post Permalink is simply the easiest solution to separate your media/attachment Permalinks.

Noted That:

To install correctly this media-post-permalink.zip.
Fisrt Download the media-post-permalink.zip to your computer
Extract/Open media-post-permalink.zip to Your Computer.
Then, Find readme.txt file inside media-post-permalink.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "media-post-permalink.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "media-post-permalink.zip" Downloaded plugin from your computer, Where you downloaded media-post-permalink.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Media Post Permalink" folder is added on left sidemenu. Now, Click on "Media Post Permalink" folder.

Noted that: If you do not see "Media Post Permalink" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Media Post Permalink Configurtions and Settings or How to work "Media Post Permalink" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "Media Post Permalink" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Media Post Permalink
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide

Guide
The easiest way to install the plugin is to use the WP built-in menu for finding and installing new plugins directly from the WordPress repositories. If you need to install this using FTP or SFTP, you should follow these steps: Upload `media-post-permalink` to the `/wp-content/plugins/` directory using your favorite FTP client. Activate the plugin through the ‘Plugins’ menu in WordPress. Apply the settings as per your requirements. That’s it.

The easiest way to install the plugin is to use the WP built-in menu for finding and installing new plugins directly from the WordPress repositories.

If you need to install this using FTP or SFTP, you should follow these steps:

Upload media-post-permalink to the /wp-content/plugins/ directory using your favorite FTP client.
Activate the plugin through the ‘Plugins’ menu in WordPress.
Apply the settings as per your requirements.
That’s it.

separate, your, mediaattachment, permalinks, solution, easiest, post, permalink, simply, media,

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Reffered: https://wordpress.org/