handling FileField and FileSystemStorage in WizardView - Django 1.4

I created a form wizard of 6 steps, 
in step sixth, have filefield for uploading docfile1

django docs is poor on this topic, google does not help.

my code working ok, but how handle filefield.

need example, thanks

forms.py

class Step6(forms.Form):

     docfile1 = forms.FileField(required=False)

view.py

1. class RegInfo(SessionWizardView):
2.     template_name = 'gest/wizard_form.html'
3.     file_storage = FileSystemStorage(location=os.path.join(settings.MEDIA_ROOT, 'docs'))
4.  
5.     def get_context_data(self, form, **kwargs):
6.         context = super(RegInfo, self).get_context_data(form, **kwargs)
7.        
8.         if self.steps.current == 'six':
9.             print 'step 6'
10.            
11.         return context
12.  
13.     def done(self, form_list, **kwargs):
14.         dati = self.get_all_cleaned_data()
15.  
16.         s = Info()
17.         s.tec = self.request.user
18.         s.dataso = dati['dataso']
19.        
20.         s.docfile1 = ????????
21.        
22.         s.save()
23.  
24.         return render_to_response('gest/done.html', {
25.             'form_data': [form.cleaned_data for form in form_list],
26.         })
27.  
28. 
    

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