This plugin creates a widget that shows a gallery of all the images in a post.

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Post Images Gallery" folder is added on left sidemenu. Now, Click on "Post Images Gallery" folder.

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

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

Guide
Download the plugin. Upload it to /wp-content/plugins. Activate it in the administration area of your wordpress blog. Put it in a widget ready theme in the administration area of your wordpress blog. Make sure to fill in the widget title and the thumbnail width an height there too, else it will not show a title and it will show the images in original size. If you don’t have a widget ready theme, you can use in your theme file. I’m working on detecting if the widget is in a widget-ready theme and add some styles to the non-widget theme then. To Do: Add support for all the mayor javascript frameworks (i.e. prototype, mootools).

Guide

Download the plugin.
Upload it to /wp-content/plugins.
Activate it in the administration area of your wordpress blog.
Put it in a widget ready theme in the administration area of your wordpress blog.
Make sure to fill in the widget title and the thumbnail width an height there too, else it will not show a title and it will show the images in original size.
If you don’t have a widget ready theme, you can use in your theme file. I’m working on detecting if the widget is in a widget-ready theme and add some styles to the non-widget theme then.
To Do: Add support for all the mayor javascript frameworks (i.e. prototype, mootools).

images, post, gallery, shows, creates, widget, plugin,

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Reffered: https://wordpress.org/