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I do not understand why in Django Rest Framework, my serializer do not serialize the file I gave it

I do a request like this in my Vue.js file:

  const formData = new FormData();
  formData.append("file", file.value);
  formData.append("amount_pages", "" + 12);

  try {
    const response = await fetch(BACKEND_URL, {
      method: "POST",
      body: formData,
    });
  } catch (e: any) {
    console.error(e);
  }

On a view like that in my Django/DRF app:

from rest_framework import generics, serializers

class MySerializer(serializers.Serializer):
    file = serializers.FileField(required=True)
    amount_pages = serializers.IntegerField()

    class Meta:
        fields = [
            "file",
            "amount_pages",
        ]

class MyView(generics.CreateAPIView):
    def post(self, request, *args, **kwargs):
        serializer = MySerializer(data=request.data)
        print(request.data)  # <QueryDict: {'file': [<TemporaryUploadedFile: part1.pdf (application/pdf)>], 'amount_pages': ['12']}>
        print(serializer.data) # {'file': None, 'amount_pages': 12}

I have already took a look at other issues but have not found any answers.

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