I am trying to implement the ISharedDataSourceStorage interface and the SaveAsync method receives a parameter of type SaveResourceModel from which I cannot access the description that the user might have written in the UI.

The support team told me that the FileSharedDataSourceStorage class internally uses a SharedDataSourceDescriptionHelper class for accessing the description. 

Please make the helper class public so that we may also use it when implementing the ISharedDataSourceStorage interface.