Audit selects

Hello experts.

Need your suggestion

DB Version  18.3 on mixed mode auditing.  Audit info goes to OS file.

audit_trail='OS'

I'm able to see all actions executed as sysdba.  

I created and enabled audit policy. "auditselects"  for a non sysdba user,

POLICY_NAME AUDIT_OPTION            AUDIT_OPTION_TYPE  AUDIT_CONDITION

----------  --------------------- ------------------- --------------------------------

AUDITSELECT READ ANY TABLE          SYSTEM PRIVILEGE   NONE

AUDITSELECT SELECT                  OBJECT ACTION      NONE

AUDITSELECT SELECT ANY DICTIONARY   SYSTEM PRIVILEGE   NONE

AUDITSELECT SELECT ANY TABLE        SYSTEM PRIVILEGE   NONE

I don't see selects in audit log. Do I need to switch to unified auditing

thanx