How to upload multiple files with django-rest-framework

I am trying to upload a file using django-rest-frame, which works when uploading a single file. But when I upload multiple files, only the last file will be saved. How can I save all the files?

Python 3.6.2， Django 2.2.3 djangorestframework 3.10.1

Below is my code

the vue：

<template>
    <input id="upload_file" type="file" multiple @change="v_upload_files"/>
</template>

<script>
  export default {
    data() {
      return {
        fileList: []
      };
    },
    methods: {
        v_upload_files(e) {
            let files = e.target.files;
            let formData = new FormData();
            for (let i = 0;i < files.length;i++) {
                formData.append(`file${i}`, files[i])
                // formData.append('file', files[i])
            }
            let url = '/upload/';

            axios.post(url, formData)
}
  }

}
</script>

models.py

class File(models.Model):
    file = models.FileField(blank=False, null=False)

    def __str__(self):
        return self.file.name

serializers.py

from rest_framework import serializers
from .models import File


class FileSerializer(serializers.ModelSerializer):

    files = serializers.ListField(child=serializers.FileField())

    class Meta:
        model = File
        fields = "__all__"

views.py

from rest_framework.parsers import MultiPartParser
from rest_framework.response import Response
from rest_framework.views import APIView
from rest_framework import status
from .serializers import FileSerializer

class FileUploadView(APIView):
    parser_class = (MultiPartParser,)

    def post(self, request, *args, **kwargs):

        altered_request_data = request.data.copy()
        in_memory_upload_files_list = [value for value in request.FILES.dict().values()]
        print(request.FILES.dict().values())
        altered_request_data.setlist('files', in_memory_upload_files_list)
        file_serializer = FileSerializer(data=altered_request_data)
        print(file_serializer)
        print(file_serializer.is_valid())
        if file_serializer.is_valid():
            file_serializer.save()
            print(file_serializer.data)
            return Response(file_serializer.data, status=status.HTTP_201_CREATED)
        else:
            return Response(file_serializer.errors, status=status.HTTP_400_BAD_REQUEST)

upload 2 files

FileSerializer(data=<QueryDict: {'file{i}': [<InMemoryUploadedFile: 20190724_BRCA_report.xlsx (application/vnd.openxmlformats-officedocument.spreadsheetml.sheet)>, <InMemoryUploadedFile: 20190724_DMD_report.xlsx (application/vnd.openxmlformats-officedocument.spread
sheetml.sheet)>], 'files': [<InMemoryUploadedFile: 20190724_DMD_report.xlsx (application/vnd.openxmlformats-officedocument.spreadsheetml.sheet)>]}>):
    id = IntegerField(label='ID', read_only=True)
    files = ListField(child=FileField(), write_only=True)
    file = FileField(max_length=100)
Bad Request: /upload/

in Browser it return

{"file":["No file was submitted."]}