django_file_copy.py

for local_field in self._meta.local_fields:
            if isinstance(local_field, models.fields.files.FileField):
                file_attr = getattr(prev_version, local_field.attname)

                if file_attr:
                    file_ = File(file_attr)

                    setattr(self, local_field.attname, file_)
        self.save()