if a file was previously played the player should ask if you want to start over or resume the next time the file was played. I just tested mine ixpand with three videos on two different phones and was ask if i wanted to start over or resume on each of them. I did pause the video before exiting and selecting another file.
Are you using the latest release of the iXpand drive app?
Can you let us know the exact steps you are using if you are not seeing the start over or resume message?
