diff --git a/django_etebase/app_settings.py b/django_etebase/app_settings.py
index 3c659c8..33dc65f 100644
--- a/django_etebase/app_settings.py
+++ b/django_etebase/app_settings.py
@@ -61,6 +61,13 @@ class AppSettings:
             return self.import_from_str(func)
         return None
 
+    @cached_property
+    def CHUNK_PATH_FUNC(self):  # pylint: disable=invalid-name
+        func = self._setting("CHUNK_PATH_FUNC", None)
+        if func is not None:
+            return self.import_from_str(func)
+        return None
+
     @cached_property
     def CHALLENGE_VALID_SECONDS(self):  # pylint: disable=invalid-name
         return self._setting("CHALLENGE_VALID_SECONDS", 60)
diff --git a/django_etebase/models.py b/django_etebase/models.py
index 397600e..f3704a3 100644
--- a/django_etebase/models.py
+++ b/django_etebase/models.py
@@ -21,6 +21,8 @@ from django.db.models import Q
 from django.utils.functional import cached_property
 from django.utils.crypto import get_random_string
 
+from . import app_settings
+
 
 UidValidator = RegexValidator(regex=r'^[a-zA-Z0-9\-_]{20,}$', message='Not a valid UID')
 
@@ -79,6 +81,10 @@ class CollectionItem(models.Model):
 
 
 def chunk_directory_path(instance, filename):
+    custom_func = app_settings.CHUNK_PATH_FUNC
+    if custom_func is not None:
+        return custom_func(instance, filename)
+
     item = instance.item
     col = item.collection
     user_id = col.owner.id