diff --git a/CHANGES.rst b/CHANGES.rst
index bc91a3a5..e422efc6 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -4,7 +4,8 @@ Changelog
 6.2.13 (unreleased)
 -------------------
 
-- Nothing changed yet.
+- Set `file_principale` field as primary, so we call @@download on the content, that file will be downloaded automatically.
+  [cekk]
 
 
 6.2.12 (2024-06-24)
diff --git a/src/design/plone/contenttypes/behaviors/multi_file.py b/src/design/plone/contenttypes/behaviors/multi_file.py
index 11e306b4..90dbc1fa 100644
--- a/src/design/plone/contenttypes/behaviors/multi_file.py
+++ b/src/design/plone/contenttypes/behaviors/multi_file.py
@@ -41,6 +41,8 @@ class IMultiFileSchema(model.Schema):
         required=False,
     )
 
+    model.primary("file_principale")
+
 
 @provider(IFormFieldProvider)
 class IMultiFile(IMultiFileSchema):
diff --git a/src/design/plone/contenttypes/restapi/serializers/dxcontent.py b/src/design/plone/contenttypes/restapi/serializers/dxcontent.py
index a87880c6..568cc3a3 100644
--- a/src/design/plone/contenttypes/restapi/serializers/dxcontent.py
+++ b/src/design/plone/contenttypes/restapi/serializers/dxcontent.py
@@ -51,7 +51,6 @@ def __call__(self, version=None, include_items=True):
 @adapter(IDexterityContainer, IDesignPloneContenttypesLayer)
 class SerializeFolderToJson(BaseFolderSerializer, MetaTypeSerializer):
     def __call__(self, version=None, include_items=True):
-
         result = super(SerializeFolderToJson, self).__call__(
             version=version, include_items=include_items
         )
diff --git a/src/design/plone/contenttypes/upgrades/to_730x.py b/src/design/plone/contenttypes/upgrades/to_730x.py
index 5ec2ca47..5d5dcf3a 100644
--- a/src/design/plone/contenttypes/upgrades/to_730x.py
+++ b/src/design/plone/contenttypes/upgrades/to_730x.py
@@ -96,7 +96,11 @@ def to_7304(context):
 
 def to_7305(context):
     mapping = SUBFOLDERS_MAPPING["Servizio"]
-    mapping = [folder for folder in mapping.get('content') if folder["id"] == "modulistica"][0]  # noqa
+    mapping = [
+        folder for folder in mapping.get("content") if folder["id"] == "modulistica"
+    ][
+        0
+    ]  # noqa
     brains = api.content.find(portal_type="Servizio")
     tot = len(brains)
     i = 0