We can see that you have an images folder in your root directory. Usually, images are present in the wp-content/uploads folder. Since this is not a normal WordPress configuration those files were not copied.
However, if you would like we can include the folder and complete the migration manually.
You can migrate to dev.mydomain.com. Just ensure that there’s a working WordPress installation.
The migration only creates a copy of the original site and the original site is unaffected.