Update insert-functions.md

Author: courtneyga

src/connections/functions/insert-functions.md

@@ -47,6 +47,9 @@ Use this page to edit and manage insert functions in your workspace.
 
 You can also use this page to [enable destination insert functions](#enable-the-insert-function) in your workspace.
 
+> warning "Storage Destination Limit"
+> Currently, you are not able to connect a Storage Destination to an Insert Function.
+
 ## Code the destination insert function
 
 Segment invokes a separate part of the function (called a "handler") for each event type that you send to your destination insert function.