Hi,
Thanks for contacting us here about this extension.
Does NextGEN gallery importer has an option to delete/remove physical file from server once it's imported from NextGen? Or it only creates a symlink to an actual file located at NextGen gallery location?
NextGEN gallery importer will not remove automatically your files of NextGen after importing them to the Media library.
WP Media Folder will generate new path of your media when importing.
Also does imported content of NextGen galleries can be offloaded to Amazon s3 as though it was in WP Media Library?
After the importing to Media library, images will be uploaded to S3 if the option is enabled.
Hope this helps!
Best Regards,