Hi @Shesh
in your syntax below optional parameter(–objectType) explanation is missing especially (to aggregate entitlement files). if nothing specified it will consider account aggregation by default.
--objectType group
-o <arg>,--objectType <arg>Optional--objectType groupFile Type; Account or Entitlement Schema. Default: Account
So please refer examples from File Upload Utility - CoLab / Community Tools - SailPoint Developer Community