Knowledge Base Help & Documentation:
What Does the Additional Option “Set first image as featured” Mean?
By choosing this option, the first image in the content body of the existing page automatically becomes a featured image for that particular page on your new website.
Tick the option “Set first image as featured” at the “Select Additional Options” box during the migration setup. As a result, the first image in the content of a page will be reflected like featured after the migration. Note that this option is available only while migrating to WordPress or Joomla.
Notice: “Set first image as featured” works only along with the “Migrate images/attachments to content body” option.
The examples are the following:
a) “Set first image as featured” option is used
b) “Set first image as featured” option is not used