[Plugin: Search and Replace] How to restore back the image using Search & Replace

I can’t seem to find any documentation on how to use it.

I had just migrated a site from the main domain to another sub domain in WordPress Multisite environment.

After that the thumnail image and some of the post image is not working. There are lot’s of unattached image as well.

How does one use this plugin to restore back the image?

https://www.ads-software.com/extend/plugins/search-and-replace/