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Since I’m assuming you’re using a relational database and your model field name is ‘photos’ you’ll want more than one photo per location.
You can do something like:
class Image(models.Model):
full_size = models.ImageField()
thumbnail = models.ImageField()
location = models.ForeignKey('app_label.Location', related_name='photos')
and remove the image field from the Location model.
To upload multiple photos, you’ll want to use a formset. Depending on the interface you want, you’ll probably want to use a model formset so the photos get their location_id set properly.
With your form, all you need to do is use the formset_factory function that you can call in your view (probably in get_context_data).
Handling the formset in your view involves some logic wrangling but there is a project called django-extra-views that implements the form with a formset logic, again, depending on the interface you’re going for here.
If you want to just add photos to a pre-existing location, that is much simpler: just include the model_formset with a location object.