Automatically creates webp images when you upload compatible media. This plugin also manages any updates and changes to the linked attachment images.

Noted That:

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

6. Now, Click on "Active Plugin"

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

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

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

Guide
Upload the contents of the zip file to the “/wp-content/plugins/mediawebp” directory. Activate the plugin through the “Plugins” menu in WordPress. You will require the GD php module to have been enabled or you will recieve a warning. Add the included code to your .htaccess file. This can be found on the settings page, by clicking on the blue circle with a white i in the centre. Then generate webp images for any exiting media including any compatible active theme images from within the plugins tool page. This can be done before or after updating your .htaccess file.

Guide

Upload the contents of the zip file to the “/wp-content/plugins/mediawebp” directory.
Activate the plugin through the “Plugins” menu in WordPress. You will require the GD php module to have been enabled or you will recieve a warning.
Add the included code to your .htaccess file. This can be found on the settings page, by clicking on the blue circle with a white i in the centre.
Then generate webp images for any exiting media including any compatible active theme images from within the plugins tool page. This can be done before or after updating your .htaccess file.

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Reffered: https://wordpress.org/