diff --git a/apps/settings/serializers/public.py b/apps/settings/serializers/public.py
index a135b1546..6e5a74c8e 100644
--- a/apps/settings/serializers/public.py
+++ b/apps/settings/serializers/public.py
@@ -56,6 +56,7 @@ class PrivateSettingSerializer(PublicSettingSerializer):
     VIRTUAL_APP_ENABLED = serializers.BooleanField()
     CHAT_AI_ENABLED = serializers.BooleanField()
     GPT_MODEL = serializers.CharField()
+    FILE_UPLOAD_SIZE_LIMIT_MB = serializers.IntegerField()
 
 
 class ServerInfoSerializer(serializers.Serializer):