Cloudiway Site Migration と Cloudiway File Migration を併用しない場合、Google Sites に埋め込まれた Google Drive ドキュメントは移行されません 。
https://help.cloudiway.com/article/why-file-licenses-are-needed-for-google-sites-migration/

 

help.cloudiway.com

Why File Licenses are needed for Google Sites Migration

If you do not use Cloudiway Site Migration and Cloudiway File Migration together, the Google Drive documents embedded in Google Sites will not be