change directory path within a pdb gives ORA-65040:

Oracle 19c Linux.

Hi community, I want to change the physical path for an expdp directory within a plugable db.

CREATE OR REPLACE DIRECTORY DATA_PUMP_DIR AS '/u01/19c/oracle_base/admin/prod/dpdump';

I get the error: ORA-65040: operation not allowed from within a pluggable database

So how can I do it or at which level (root container) ?

Thank's for help.

Olivier