Скачивание файала

class Post(models.Model):
    ...
    scan_copy = models.FileField(name='Скан-копия', max_length=150, default='')

BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
...
STATIC_URL = '/static/'
STATIC_ROOT = os.path.join(BASE_DIR, 'static/')
MEDIA_URL = '/media/'
MEDIA_ROOT = os.path.join(BASE_DIR, 'media/')

urlpatterns = [
    path('admin/', admin.site.urls),
    path('', include('posts.urls')),
]
 
if settings.DEBUG:
    urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

urlpatterns = [
    path('', views.PostList.as_view(), name='home'),
    path('<slug:slug>/', views.PostDetail.as_view(), name='post_detail')
]

class PostList(generic.ListView):
    queryset = Post.objects.filter(status=Post.PUBLISH).order_by('-created_on')
    template_name = 'index.html'
 
 
class PostDetail(generic.DetailView):
    model = Post
    template_name = 'post_detail.html'

    def __str__(self):
        return self.title

scan_copy = models.FileField(upload_to='scan_copy', name='Скан-копия', max_length=150, default='')

scan_copy = models.FileField(name='Скан-копия', max_length=150, default='')