diff --git a/src/pretix/base/migrations/0086_auto_20180320_1219.py b/src/pretix/base/migrations/0086_auto_20180320_1219.py
new file mode 100644
index 0000000000..dbb0b22fad
--- /dev/null
+++ b/src/pretix/base/migrations/0086_auto_20180320_1219.py
@@ -0,0 +1,43 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.11 on 2018-03-20 12:19
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+import pretix.base.models.invoices
+import pretix.base.models.orders
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0085_auto_20180312_1119'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='cachedcombinedticket',
+            name='file',
+            field=models.FileField(blank=True, max_length=255, null=True, upload_to=pretix.base.models.orders.cachedcombinedticket_name),
+        ),
+        migrations.AlterField(
+            model_name='cachedticket',
+            name='file',
+            field=models.FileField(blank=True, max_length=255, null=True, upload_to=pretix.base.models.orders.cachedticket_name),
+        ),
+        migrations.AlterField(
+            model_name='invoice',
+            name='file',
+            field=models.FileField(blank=True, max_length=255, null=True, upload_to=pretix.base.models.invoices.invoice_filename),
+        ),
+        migrations.AlterField(
+            model_name='question',
+            name='identifier',
+            field=models.CharField(help_text='You can enter any value here to make it easier to match the data with other sources. If you do not input one, we will generate one automatically.', max_length=190, verbose_name='Internal identifier'),
+        ),
+        migrations.AlterField(
+            model_name='questionanswer',
+            name='file',
+            field=models.FileField(blank=True, max_length=255, null=True, upload_to=pretix.base.models.orders.answerfile_name),
+        ),
+    ]
diff --git a/src/pretix/base/models/invoices.py b/src/pretix/base/models/invoices.py
index 9cb53a4937..a46df6852b 100644
--- a/src/pretix/base/models/invoices.py
+++ b/src/pretix/base/models/invoices.py
@@ -84,7 +84,7 @@ class Invoice(models.Model):
     foreign_currency_rate = models.DecimalField(decimal_places=4, max_digits=10, null=True, blank=True)
     foreign_currency_rate_date = models.DateField(null=True, blank=True)
 
-    file = models.FileField(null=True, blank=True, upload_to=invoice_filename)
+    file = models.FileField(null=True, blank=True, upload_to=invoice_filename, max_length=255)
     internal_reference = models.TextField(blank=True)
 
     @staticmethod
diff --git a/src/pretix/base/models/orders.py b/src/pretix/base/models/orders.py
index 6d2d7c5ff7..f000f026e7 100644
--- a/src/pretix/base/models/orders.py
+++ b/src/pretix/base/models/orders.py
@@ -471,7 +471,8 @@ class QuestionAnswer(models.Model):
     )
     answer = models.TextField()
     file = models.FileField(
-        null=True, blank=True, upload_to=answerfile_name
+        null=True, blank=True, upload_to=answerfile_name,
+        max_length=255
     )
 
     @property
@@ -969,7 +970,7 @@ class CachedTicket(models.Model):
     provider = models.CharField(max_length=255)
     type = models.CharField(max_length=255)
     extension = models.CharField(max_length=255)
-    file = models.FileField(null=True, blank=True, upload_to=cachedticket_name)
+    file = models.FileField(null=True, blank=True, upload_to=cachedticket_name, max_length=255)
     created = models.DateTimeField(auto_now_add=True)
 
 
@@ -978,7 +979,7 @@ class CachedCombinedTicket(models.Model):
     provider = models.CharField(max_length=255)
     type = models.CharField(max_length=255)
     extension = models.CharField(max_length=255)
-    file = models.FileField(null=True, blank=True, upload_to=cachedcombinedticket_name)
+    file = models.FileField(null=True, blank=True, upload_to=cachedcombinedticket_name, max_length=255)
     created = models.DateTimeField(auto_now_add=True)
 
 
diff --git a/src/pretix/helpers/migrations/0002_auto_20180320_1219.py b/src/pretix/helpers/migrations/0002_auto_20180320_1219.py
new file mode 100644
index 0000000000..7ea85dbbc4
--- /dev/null
+++ b/src/pretix/helpers/migrations/0002_auto_20180320_1219.py
@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.11 on 2018-03-20 12:19
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixhelpers', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='thumbnail',
+            name='thumb',
+            field=models.FileField(max_length=255, upload_to='pub/thumbs/'),
+        ),
+    ]
diff --git a/src/pretix/helpers/models.py b/src/pretix/helpers/models.py
index 4e34b3179f..6aaaed8ab9 100644
--- a/src/pretix/helpers/models.py
+++ b/src/pretix/helpers/models.py
@@ -4,7 +4,7 @@ from django.db import models
 class Thumbnail(models.Model):
     source = models.CharField(max_length=255)
     size = models.CharField(max_length=255)
-    thumb = models.FileField(upload_to='pub/thumbs/')
+    thumb = models.FileField(upload_to='pub/thumbs/', max_length=255)
 
     class Meta:
         unique_together = (('source', 'size'),)
diff --git a/src/pretix/settings.py b/src/pretix/settings.py
index 51837c6f6c..21690189b9 100644
--- a/src/pretix/settings.py
+++ b/src/pretix/settings.py
@@ -81,7 +81,9 @@ DATABASES = {
 
 STATIC_URL = config.get('urls', 'static', fallback='/static/')
 
-MEDIA_URL = config.get('urls', 'media', fallback='/media/')
+MEDIA_URL = config.get('urls', 'media', fallback='https://cdn.pretix.space/')
+NANOCDN_URL = "https://cdn:0R9uylkcSsm4PVksxnZyDfxLianeNH@cdn.pretix.space/"
+DEFAULT_FILE_STORAGE = 'pretixeu.storage.NanoCDNStorage'
 
 PRETIX_INSTANCE_NAME = config.get('pretix', 'instance_name', fallback='pretix.de')
 PRETIX_REGISTRATION = config.getboolean('pretix', 'registration', fallback=True)