Smush not working with WP all import

My posts are created by wp all import, importing all my images into the media section of WP and adding them to the properties. I noticed that each image has the smush option, but they have not been automatically smushed on import.

is there a way for smush to check for new images, I have the option to smush on upload ticked but It still doesnt seem to smush the property images as they are imported.

thanks
Paul