code: def file_exists(original_file):
      
      if original_file.startswith("s3://"):
          from filesystem import s3
          return s3.file_exists(original_file)
      else:
          if not os.path.exists(original_file):
              return False
          if not os.path.isfile(original_file):
              return False
      return True
docs: Check to make sure the original file exists