Notify admin in django REST API

while uploading files i need to notify admin.How can i do this

models.py

class File(models.Model):
  file = models.FileField(blank=False, null=False)
  remark = models.CharField(max_length=20)
  timestamp = models.DateTimeField(auto_now_add=True)

Serializers.py

class FileSerializer(serializers.ModelSerializer):
  class Meta():
    model = File
    fields = ('file', 'remark', 'timestamp')

Views.py

class FilesViewSet(viewsets.ModelViewSet):
    queryset = File.objects.all()
    serializer_class = FileSerializer
    permission_classes = (permissions.IsAuthenticated,)