Makes video thumbnails, allows resolution switching, and embeds responsive self-hosted videos and galleries.

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Video Embed & Thumbnail Generator" folder is added on left sidemenu. Now, Click on "Video Embed & Thumbnail Generator" folder.

Noted that: If you do not see "Video Embed & Thumbnail Generator" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

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

Guide

Guide
Upload the unzipped folder `video-embed-thumbnail-generator` to the `/wp-content/plugins/` directory. Activate the plugin through the ‘Plugins’ menu in WordPress. Make sure you have all your MIME types configured correctly. Many servers don’t have .mp4, .m4v, or .ogv configured, and even more don’t have .webm. There are a number of ways to do this. In your public_html directory you can edit your .htaccess file and add the following lines: AddType video/ogg .ogv AddType video/mp4 .mp4 AddType video/mp4 .m4v AddType video/webm .webm Optional: `AddType video/mp4 .mov` will help with IE playback of .mov files but could interfere with other QuickTime players.

Upload the unzipped folder video-embed-thumbnail-generator to the /wp-content/plugins/ directory.
Activate the plugin through the ‘Plugins’ menu in WordPress.
Make sure you have all your MIME types configured correctly. Many servers don’t have .mp4, .m4v, or .ogv configured, and even more don’t have .webm. There are a number of ways to do this. In your public_html directory you can edit your .htaccess file and add the following lines:
AddType video/ogg .ogv
AddType video/mp4 .mp4
AddType video/mp4 .m4v
AddType video/webm .webm
Optional: AddType video/mp4 .mov will help with IE playback of .mov files but could interfere with other QuickTime players.

self, responsive, hosted, videos, galleries, embeds, switching, video, thumbnails, allows,

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Reffered: https://wordpress.org/