Add file field for serializer

courses/videos/serializers.py

@@ -7,7 +7,7 @@ class VideoSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = Video
-        fields = ('id', 'name', 'youtube_id',)
+        fields = ('id', 'name', 'youtube_id', 'file')
         read_only_fields = ('file',)