如何在Django中存储生产中的私有文档？

from django.db import models

class PrivateDocument(models.Model):
    owner = models.ForeignKey(User, on_delete=models.CASCADE)
    file = models.FileField(upload_to='private_documents/')
    created_at = models.DateTimeField(auto_now_add=True)

MEDIA_ROOT = os.path.join(BASE_DIR, 'private_documents')
MEDIA_URL = '/media/'

from django.shortcuts import render, redirect
from django.core.files.storage import FileSystemStorage

def upload_private_document(request):
    if request.method == 'POST' and request.FILES['file']:
        file = request.FILES['file']
        fs = FileSystemStorage()
        filename = fs.save(file.name, file)
        PrivateDocument.objects.create(owner=request.user, file=filename)
        return redirect('private_document_list')
    return render(request, 'upload_private_document.html')

def private_document_list(request):
    documents = PrivateDocument.objects.filter(owner=request.user)
    return render(request, 'private_document_list.html', {'documents': documents})

from django.urls import path
from . import views

urlpatterns = [
    path('upload/', views.upload_private_document, name='upload_private_document'),
    path('list/', views.private_document_list, name='private_document_list'),
]

<!-- private_document_list.html -->
{% for document in documents %}
    <p>{{ document.file.name }}</p>
    <a href="{{ document.file.url }}">Download</a>
{% endfor %}