djangae ImageField not working with CloudStorage - google-app-engine

Question

i'm using Djangae to run my application on google appengine , i'm trying to store images to google CloudStorage ,
i followed the same exact proceedure mentioned here but nothing written on the CloudStorage , no errors no exceptions !
this is the model class that i have :
class Person(models.Model):
user = models.ForeignKey(User, default=1)
name = models.CharField(max_length=250,null=True)
last_name = models.CharField(max_length=500)
age= models.IntegerField(default=100)
martial_status = models.CharField(max_length=20, choices=STATUS_CHOICES, default=("Single"))
sex = models.CharField(max_length=20, choices=SEX_CHOICES, default=("Male"))
mobile=models.CharField(max_length=26,default=0011)
amount_paid=models.CharField(max_length=256,null=True)
amount_left = models.CharField(max_length=256, null=True,blank=True)
note=models.CharField(max_length=256,null=True,blank=True)
address=models.CharField(max_length=256,null=True,blank=True)
date = models.DateField(("Date"), default=date.today,blank=True)
chief_complain = models.CharField(max_length=256,null=True,blank=True)
treatment_plan=models.CharField(max_length=256,null=True,blank=True)
treatment_done=models.CharField(max_length=256,null=True,blank=True)
#picture = models.ImageField(blank=True)
picture = models.ImageField(upload_to='/image/', storage=public_storage,blank=True)
def __str__(self):
return self.name
the ModelForm :
class PersonForm(forms.ModelForm):
class Meta:
model = Person
fields = ['name', 'last_name', 'age', 'martial_status', 'mobile', 'sex',
'amount_paid','amount_left','note', 'address','date','picture','treatment_done','treatment_plan','chief_complain']
widgets = {
'name': forms.TextInput(attrs={'required': True, 'class': 'form-control',
'placeholder': 'name'}),
'last_name': forms.TextInput(attrs={'required': True, 'class': 'form-control',
'placeholder': 'lastname'}),
'age': forms.TextInput(attrs={'required': True, 'class': 'form-control',
'placeholder': 'age'}),
'amount_paid': forms.TextInput(attrs={'required': True, 'class': 'form-control',
'placeholder': 'amount paid'}),
'amount_left': forms.TextInput(attrs={'required': True, 'class': 'form-control',
'placeholder': 'amount left'}),
'note': forms.TextInput(attrs={'required': False, 'class': 'form-control',
'placeholder': 'Patient History'}),
'address': forms.TextInput(attrs={'required': False, 'class': 'form-control',
'placeholder': 'Current address'}),
'chief_complain': forms.TextInput(attrs={'required': False, 'class': 'form-control',
'placeholder': 'chief complain'}),
'treatment_plan': forms.Textarea(attrs={'required': False, 'class': 'form-control',
'placeholder': 'treatment plan','rows':'3'}),
'treatment_done': forms.Textarea(attrs={'required': False, 'class': 'form-control',
'placeholder': 'treatment done','rows':'3'}),
}
the template :
<h2>Add person</h2>
<form method="post">
{% csrf_token %}
<div class="row">
<div class="col-sm-4 form-group">
<label for="name" >{% trans "Name" %}</label>
{{ form.name|add_class:"form-control" }}
</div>
..<code snippet>..
<div class="row">
<div class="col-sm-4 form-group">
<label for="address">{% trans "Address" %}</label>
{{ form.address|add_class:"form-control" }}
</div>
<div class="col-sm-4 form-group">
<label for="pic">{% trans "Picture" %}</label>
{{form.picture}}
</div>
</div>

Answer 1

that's all what you have to do:
from djangae import fields, storage
public_storage = storage.CloudStorage(
bucket='my_project_id.appspot.com', google_acl='public-read')
class Picture(models.Model):
picture = models.FileField(upload_to='image', storage=public_storage, blank=True)