I would suggest the following-1. Create page component with common clientlibs2. Create a template type using page component & template editor.3.create templates for your brands and content author the clientlib specific to that brand through page design (check template editor page design)4. In this w...
Then its visible with the error that data which you are trying to add to a node is invalid. Check any asset which is already in dam and try ti post same data and see how it behaves.