diff --git a/store/models.py b/store/models.py
index d5e413a..27902d4 100644
--- a/store/models.py
+++ b/store/models.py
@@ -357,7 +357,8 @@ class Checklist(models.Model):
 
         if self.promocode_id:
             # We assume that working promocode was bound correctly through serializer
-            # and intentionally don't check if promocode is active here
+            # and intentionally don't check if promocode is active here.
+            # It's also good for archive orders.
             promocode = self.promocode
             price -= promocode.discount * self.price_rub / 100
 
diff --git a/store/serializers.py b/store/serializers.py
index f1c0842..c83084f 100644
--- a/store/serializers.py
+++ b/store/serializers.py
@@ -120,12 +120,12 @@ class ChecklistSerializer(serializers.ModelSerializer):
     def update(self, instance, validated_data):
         images = self._collect_images_by_fields(validated_data)
 
-        self._create_main_images(instance, images.get('main_images'))
-        self._create_payment_proofs(instance, images.get('payment_proof'))
-
         # Perform update
         instance: Checklist = super().update(instance, validated_data)
 
+        self._create_main_images(instance, images.get('main_images'))
+        self._create_payment_proofs(instance, images.get('payment_proof'))
+
         # Invalidate prefetched images
         delattr(instance, '_images')