Unable to store images to database - asp.net

Question

The following code below:
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(Car model, HttpPostedFileBase file)
{
var currentUser = UserManager.FindById(User.Identity.GetUserId());
var user = this.db.Users.Where(u => u.Id == currentUser.Id).FirstOrDefault();
if(ModelState.IsValid)
{
if (file != null && file.ContentLength > 0)
{
var photo = new FilePath
{
FileName = Guid.NewGuid().ToString() + System.IO.Path.GetExtension(file.FileName),
FileType = FileType.Photo
};
model.FilePaths = new List<FilePath>();
model.FilePaths.Add(photo);
file.SaveAs(Path.Combine(Server.MapPath("~/Images/"), photo.FileName));
}
user.Cars.Add(model);
db.SaveChanges();
return RedirectToAction("Default", "Home");
}
SetCategoryViewBag(model.Category.CategoryId);
return View(model);
}
Won't let me to store any images to the database. The image table doesn't store any information at all. However, the cars table is ok, but images is still showing as null.
What have I done wrong here?
Edit:
Car model:
public class Car
{
[Key]
public int CarId { get; set; }
public string Title { get; set; }
public int Price { get; set; }
public virtual Category Category { get; set; }
public int CategoryId { get; set; }
public virtual ICollection<FilePath> FilePaths { get; set; }
}
FilePath model:
public class FilePath
{
public int FilePathId { get; set; }
[StringLength(255)]
public string FileName { get; set; }
public FileType FileType { get; set; }
public int CarId { get; set; }
public virtual Car Cars { get; set; }
}