diff --git a/attachment_azure/models/ir_attachment.py b/attachment_azure/models/ir_attachment.py
index 2bb717e..2fc03c8 100644
--- a/attachment_azure/models/ir_attachment.py
+++ b/attachment_azure/models/ir_attachment.py
@@ -153,7 +153,7 @@ class IrAttachment(models.Model):
         if fname.startswith("azure://"):
             key = fname.replace("azure://", "", 1).lower()
             if '/' in key:
-                container_name, key = key.split('/')
+                container_name, key = key.split('/', 1)
             else:
                 container_name = None
             container_client = self._get_azure_container(container_name)
@@ -200,7 +200,7 @@ class IrAttachment(models.Model):
         if fname.startswith("azure://"):
             key = fname.replace("azure://", "", 1).lower()
             if '/' in key:
-                container_name, key = key.split('/')
+                container_name, key = key.split('/', 1)
             else:
                 container_name = None
             container_client = self._get_azure_container(container_name)