It works!

src/paperless/urls.py

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+"""paperless URL Configuration
+
+The `urlpatterns` list routes URLs to views. For more information please see:
+    https://docs.djangoproject.com/en/1.9/topics/http/urls/
+Examples:
+Function views
+    1. Add an import:  from my_app import views
+    2. Add a URL to urlpatterns:  url(r'^$', views.home, name='home')
+Class-based views
+    1. Add an import:  from other_app.views import Home
+    2. Add a URL to urlpatterns:  url(r'^$', Home.as_view(), name='home')
+Including another URLconf
+    1. Add an import:  from blog import urls as blog_urls
+    2. Import the include() function: from django.conf.urls import url, include
+    3. Add a URL to urlpatterns:  url(r'^blog/', include(blog_urls))
+"""
+from django.conf import settings
+from django.conf.urls import url, static
+from django.contrib import admin
+
+urlpatterns = [
+    url(r'^admin/', admin.site.urls),
+] + static.static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)