This plugin adds the [img] shortcode which replaces the `` html tag.

Noted That:

To install correctly this cc-img-shortcode.zip.
Fisrt Download the cc-img-shortcode.zip to your computer
Extract/Open cc-img-shortcode.zip to Your Computer.
Then, Find readme.txt file inside cc-img-shortcode.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 "cc-img-shortcode.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 "cc-img-shortcode.zip" Downloaded plugin from your computer, Where you downloaded cc-img-shortcode.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "CC-IMG-Shortcode" folder is added on left sidemenu. Now, Click on "CC-IMG-Shortcode" folder.

Noted that: If you do not see "CC-IMG-Shortcode" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about CC-IMG-Shortcode Configurtions and Settings or How to work "CC-IMG-Shortcode" 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 "CC-IMG-Shortcode" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is CC-IMG-Shortcode
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
From your WordPress Dashboard Go to ‘Plugins > Add New’ Search for ‘CC-IMG-Shortcode’ Activate the plugin from the Plugin section on your WordPress Dashboard. From WordPress.org Download ‘CC-IMG-Shortcode’. Upload the ‘CC-IMG-Shortcode’ directory to your ‘/wp-content/plugins/’ directory using your favorite method (ftp, sftp, scp, etc…) Activate the plugin from the Plugin section in your WordPress Dashboard. Once Activated Simply add new media to post/page via ‘Add media’ button in your post/page edit page. Multisite The plugin can be activated and used for just about any use case. Activate at the site level to load the plugin on that site only. Activate at the network level for full integration with all sites in your network (this is the most common type of multisite installation).

Guide

From your WordPress Dashboard

Go to ‘Plugins > Add New’
Search for ‘CC-IMG-Shortcode’
Activate the plugin from the Plugin section on your WordPress Dashboard.

From WordPress.org

Download ‘CC-IMG-Shortcode’.
Upload the ‘CC-IMG-Shortcode’ directory to your ‘/wp-content/plugins/’ directory using your favorite method (ftp, sftp, scp, etc…)
Activate the plugin from the Plugin section in your WordPress Dashboard.

Once Activated

Simply add new media to post/page via ‘Add media’ button in your post/page edit page.

Multisite

The plugin can be activated and used for just about any use case.

Activate at the site level to load the plugin on that site only.
Activate at the network level for full integration with all sites in your network (this is the most common type of multisite installation).

replaces, html, which, shortcode, adds, plugin,

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Reffered: https://wordpress.org/