See on Wordpress.org.
Download Post Thumbnail Extras and unzip it to your wp-content/plugins
directory. Alternately, use Wordpress’ plugin updater to automatically install
the stable version.
Download Stable Download Development View @ Wordpress Plugins
Use the shortcode [pt] in your posts to quickly embed the featured image as a
thumbnail. Use the attribute 'size' to change to a different post-thumbnail
size (e.g. [pt size='medium']). You can also use any image in your media
gallery if you know the id, by using the id attribute ([pt id='100']).
Use the link attribute to wrap the image in a link.
link='file' will create a link to the full size image.link='post' will create a link to the attachment page.link='http...' creates a link to any URL.Use the media library to quickly add this shortcode for the selected image by
pressing the “Insert shortcode” button.

In Settings → Media, click the plus sign to add a new post thumbnail.
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Update the width/height and whether or not the post-thumbnail should be
cropped to an exact size. (If the width or height is set to 0, that boundary
constraint is not enforced – effectively, it’s infinite). Make sure you
click the “save” button so that the changes are stored in the database.
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If you want to report an issue:
If you’ve found this plugin valuable in any way, consider donating to my tip jar. (This is so my wife doesn’t murder me for staying on the computer too late. :D)