As of version 15.7.1, Replication Agent for Oracle no longer requires direct access to the Oracle archive redo logs unless it is configured to truncate these logs without using the Oracle Recovery Manager (RMAN).
However, Replication Agent for Oracle checks the directory indicated by pdb_archive_path and issues an error if the Oracle archive redo logs are not visible or readable, regardless of whether or not Replication Agent for Oracle uses RMAN to truncate the archive redo logs. Consequently, you may not be able to configure Replication Agent for Oracle to run from a remote host.
If Replication Agent for Oracle and the primary Oracle database are not located on the same host, set pdb_archive_path to a valid local directory that matches the path to the archive redo logs on the remote host.