Data Importer Public Data tenant mapping

Document ID : KB000103816
Last Modified Date : 13/07/2018
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Trying to import assets through Data Importer, and would like them to be accessible to all tenants. Setting the tenant to Public Data didn't work as expected. How can this be done?
Public tenants in the database have the tenant field as NULL.
Go to Administration - System Configuration - Data Importer Engine. There is a parameter for:
String representing No Data or Null Value in Import Data File (case insensitive):

If this is NULL, use the word NULL for the tenant mapping.