How does Alamofire "upload" images from Swift to a backend? - swift

Question

I am trying to upload images from Swift to my Django backend so that I can store them in Google Cloud Storage and access them as "foreign keys" in my database models in django. There seems to be a built in library to bridge Django models and Google Storage https://django-storages.readthedocs.io/en/latest/backends/gcloud.html.
Reference upload image to server using Alamofire.
Before sending an image to the backend, the image is converted into a UIImageJPEGRepresentation. How exactly is Alamofire then sending the image via "multipartFormData"? Is it simply sending the raw UIImageJPEGRepresentation as a string?
I am asking this because I need to somehow convert this image data I receive in my backend and store it in a Django model and simultaneously upload it to Google Storage.
From the documentation:
>>> class Resume(models.Model):
... pdf = models.FileField(upload_to='pdfs')
... photos = models.ImageField(upload_to='photos')
To store a local file to cloud storage and at the same time in a model field:
>>> obj1.pdf.save('django_test.txt', ContentFile('content'))
>>> obj1.pdf
<FieldFile: tests/django_test.txt>
Would something like this work for an image sent from Alamofire?
>>> obj1.photos.save(<Insert whatever was sent from Alamofire>)
If so, how do you access the data sent from Alamofire?