diff --git a/videodinges/admin.py b/videodinges/admin.py
index 2c3a133..21431d5 100644
--- a/videodinges/admin.py
+++ b/videodinges/admin.py
@@ -1,10 +1,26 @@
+from django import forms
 from django.contrib import admin
+from django.core.exceptions import ValidationError
 
 from . import models
 
-class TranscodingsInline(admin.TabularInline):
+class TranscodingsForm(forms.ModelForm):
+	def clean(self):
+		cleaned_data = super().clean()
+		if not cleaned_data['url'] and not cleaned_data['upload']:
+			validation_error = ValidationError('Either url or upload must be given', code='invalid')
+			self.add_error('url', validation_error)
+			self.add_error('upload', validation_error)
+		if cleaned_data['url'] and cleaned_data['upload']:
+			validation_error = ValidationError('Cannot fill both url and upload', code='invalid')
+			self.add_error('url', validation_error)
+			self.add_error('upload', validation_error)
+		return cleaned_data
+
+class TranscodingsInline(admin.StackedInline):
 	model = models.Transcoding
-	fields = ['quality', 'file']
+	form = TranscodingsForm
+	fields = ['quality', 'url', 'upload']
 	extra = 0
 
 class VideoAdmin(admin.ModelAdmin):
@@ -12,4 +28,5 @@ class VideoAdmin(admin.ModelAdmin):
 	fields = ['title', 'description', 'slug']
 	inlines = [TranscodingsInline]
 
-admin.site.register(models.Video, VideoAdmin)
\ No newline at end of file
+admin.site.register(models.Video, VideoAdmin)
+admin.site.register(models.Upload)
diff --git a/videodinges/models.py b/videodinges/models.py
index 82b907c..4bd2779 100644
--- a/videodinges/models.py
+++ b/videodinges/models.py
@@ -1,7 +1,10 @@
+import os
 from datetime import datetime
 from typing import NamedTuple, Optional
 
 from django.db import models
+from django.db.models import constraints
+from django.db.models.query_utils import Q
 
 class Quality(NamedTuple):
 	name: str
@@ -32,12 +35,19 @@ class Video(models.Model):
     def __str__(self):
         return self.title
 
+class Upload(models.Model):
+	id = models.AutoField(primary_key=True)
+	file = models.FileField()
+
+	def __str__(self):
+		return os.path.basename(self.file.path)
 
 class Transcoding(models.Model):
     id = models.AutoField(primary_key=True)
     video = models.ForeignKey(Video, on_delete=models.CASCADE, related_name='transcodings')
     quality = models.CharField(choices=((quality.name, quality.name) for quality in qualities), max_length=128)
-    file = models.FileField()
+    upload = models.OneToOneField(Upload, on_delete=models.PROTECT, blank=True, null=True)
+    url = models.CharField(max_length=256, null=True, blank=True, unique=True)
 
     def __str__(self):
         return self.quality
@@ -48,6 +58,11 @@ class Transcoding(models.Model):
 
     class Meta:
         unique_together = ('video', 'quality')
+        constraints = [constraints.CheckConstraint(check=Q(upload__isnull=False) | Q(url__isnull=False),
+                                                   name='upload_or_url_is_filled'),
+                       constraints.CheckConstraint(check=~(Q(upload__isnull=False) & Q(url__isnull=False)),
+                                                   name='upload_and_url_cannot_both_be_filled'),
+                      ]
 
 def get_quality_by_name(name: str) -> Optional[Quality]:
 	for quality in qualities: