Maybe it's just late here, but I cannot understand jranaudo's original question, so Luke's response is even more mysterious. Luke, could you please explain what he is asking for that is different from what Snagit is supposed to do? Many thanks.
Snagit 2019.1.1 was just released and it includes an option to leave the original file from Grab, note that this is off by default, so you'll need to enable it in Snagit's capture preferences. Thanks again for the suggestion!