Here is a short video to show how the foot naturally moves on a live human with the foot on the ground and a comparison to being in orthotics. The goal of this video is to share information so that you are more informed about your feet. There is a time and place for everything and orthotics may provide a short term benefit for some people. I am not giving advise on what you should or shouldn't do, however I am looking from the perspective of what is natural to the human body, how we are born barefoot and the foot's requirement to move and loads it's own tissues as our centre of mass moves over your foot in walking gait.
This is a very good, unbiased read by Ian Griffith's a well known Sports Podiatrist.