I willbe filing for chapter 7 in Florida. One of my debts its a car that is 10000 upside down. Should I return the car? If so when before filing or af

It is up to you. Since there is no interest from the trustee as there is no equity in the car, you can simply keep making your payments and keep the car. You may have to reaffirm the debt. Consider though, if you are unhappy with the car, a Chapter 7 bankruptcy gives you the opportunity to walk away from the debt. You can only file every eight years.