Rocket Galleries is the gallery manager WordPress never had. Easily create and manage galleries from one intuitive panel.

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Rocket Galleries" folder is added on left sidemenu. Now, Click on "Rocket Galleries" folder.

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

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

Guide

Guide
Display a gallery To display a gallery, you can use any of the following methods. In each example, replace the “1” with the ID of the gallery you wish to display. In a post/page: Simply insert the shortcode below into the post/page. `[rocketgalleries id="1"]` In your theme: To insert a gallery in your theme, add the following code to the appropriate theme file.

Display a gallery

To display a gallery, you can use any of the following methods. In each example, replace the “1” with the ID of the gallery you wish to display.

In a post/page:
Simply insert the shortcode below into the post/page.

[rocketgalleries id="1"]

In your theme:
To insert a gallery in your theme, add the following code to the appropriate theme file.

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Reffered: https://wordpress.org/