programatically trigger a smush

I have a site that is using an import plugin that seems to bypass whatever action that WP Smush Pro hooks into to automatically smush images that are uploaded to the Media library. Perhaps WP Smush Pro wasn't intended to run during an import? Maybe you're checking WP_IMPORTING?

Anyway ---- just wondering if you could save me the time and point me in the direction of a way to manually trigger a smush on an image. That way I could just write my own hook that fires when this import plugin finishes importing a post, then have WP Smush Pro fire off and process all the images imported with it.