I've got an existing VM with 3 VHDX files and running on a Windows Server 2012 R2 Hyper-V host.  The VM is already configure with "Hyper-V Replica", and has been replicating successfully to a DR Site host for several months now.  I've recently added a new VHDX to the VM of source server.  This new virtual hard drive (4th VHDX) is not being replicated with the replica server VM.  How can I add this VHDX file for the replication without disturbing existing settings?

In addition to that, As I checked the other way, I have removed replication from both sides and re-enabled the replication as a new with "Use an existing virtual machine on the Replica server as the initial copy" option. But there is an error while finishing it.