title: django add pdf to a request value
body: <p>in the following request I receive a total of 10 pdfs which I must combine in one document
  once this is done I have to upload it to the client model which stores the files in aws s3, once I pass the file with all the pdfs together it gives me the following error</p>
  <pre><code>{
      &quot;error&quot;: true,
      &quot;message&quot;: {
          &quot;documents&quot;: [
              &quot;The submitted data was not a file. Check the encoding type on the form.&quot;
          ]
      }
  }
  </code></pre>
  <p>this is mi code</p>
  <pre><code> merger = PdfFileMerger()
                      for x in request.FILES:
                          print(request.FILES[x])
                          merger.append(request.FILES[x])
                      merger.write(os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), 'media/' + str(getUser.id) + '.pdf'))
                      merger.close()
                      
                      pdf = open(os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), 'media/' + str(getUser.id) + '.pdf'), 'rb')
                      # set the client Data
                      clientData = {
                          'type_client': request.data['type_client'],
                          'type_identity': request.data['type_identity'],
                          'document_number': request.data['document_number'],
                          'first_name': request.data['first_name'] if 'first_name' in request.data else None,
                          'last_name': request.data['last_name'] if 'last_name' in request.data else None,
                          'social_reason': request.data['social_reason'] if 'social_reason' in request.data else None,
                          'address': request.data['address'],
                          'city': request.data['city'],
                          'email': request.data['email'],
                          'phone_number': request.data['phone_number'],
                          'ciiu': request.data['ciiu'],
                          'broker': request.data['broker'],
                          'user': getUser.id,
                          'documents': pdf,
                          'status': 0,
                          'income': request.data['income'],
                          'entered_by': request.user.id
                      }
                      # Create a new client
                      client = ClientSerializer(data=clientData)
  </code></pre>
  <p>this is my model</p>
  <pre><code>from django.db import models
  
  # Relations
  from apps.misc.models import City, TypeIdentity, TypeCLient, CIIU
  from apps.clients.api.models.broker.index import Broker
  from apps.authentication.api.models.user.index import User
  
  
  class Client(models.Model):
      id              = models.CharField(max_length=255, unique=True,primary_key=True, editable=False)
      type_client     = models.ForeignKey(TypeCLient, on_delete=models.CASCADE, blank=True)
      type_identity   = models.ForeignKey(TypeIdentity, on_delete=models.CASCADE, blank=True)
      document_number = models.CharField(max_length=255, blank=True, unique=True)
      first_name      = models.CharField(max_length=255, blank=True, null=True)
      last_name       = models.CharField(max_length=255, blank=True, null=True)
      social_reason   = models.CharField(max_length=255, blank=True, null=True)
      city            = models.ForeignKey(City, on_delete=models.CASCADE, blank=True)
      address         = models.CharField(max_length=255, blank=True)
      email           = models.CharField(max_length=255, blank=True, unique=True)
      phone_number    = models.CharField(max_length=255, blank=True, unique=True)
      ciiu            = models.ForeignKey(CIIU, on_delete=models.CASCADE, blank=True)
      broker          = models.ForeignKey(Broker, on_delete=models.CASCADE, blank=True)
      user            = models.ForeignKey(User, on_delete=models.CASCADE, blank=True)
      documents       = models.FileField(upload_to='documents/')
      income          = models.SmallIntegerField(blank=True, default=0)
      entered_by      = models.ForeignKey(User, on_delete=models.CASCADE, blank=True, null=True, related_name='entered_by')
      state           = models.BooleanField(default=False)
      created_at      = models.DateTimeField(auto_now_add=True)
      updated_at      = models.DateTimeField(null=True, default=None)
  
      class Meta:
          db_table = 'clients'
          verbose_name = 'clients'
          verbose_name_plural = 'clients'
          ordering = ['created_at']
  
  </code></pre>
  <p>as you can see in the documents property of the clientData dict I assign the combined pdf previously, is there any way to solve this?</p>