Can you point in the direction of finding solution to enable authors to import their V5 data with custom attribute mapped (import mapping defined with business rule not cat rule script). Our solution works with Leaders but not authors since import scheme is coexistence. i don't know if for example "migration" can be selected instead of "coexistence" during import?

Usually customer users that are Authors were the creators of V5 files so authors need this ability to import files with custom attributes reused