[WP Smush Pro] WP smush pro

Hi I have installed WP smush pro, what I want to know is if I perform a bulk compression. will all images in the the upload folder be compressed and essentially be updated on the site. I noticed that with WP smush it just compressed the four alternate size images but feature images were still the same size on the site. I am hoping with Smush pro everything that is published on the site will be compressed and updates. Also can I please get some instructions on how to smush images that are not in the upload folder.