This is not a bug. The LAN file copy is not monitored by NetMaster intentionally.
The way Windows is designed, this type of traffic originates from the SYSTEM process and is usually local (not Internet). So we decided to ignore it in NetMaster, as it can't be attributed to a specific application.
I am using TeraCopy (from codesector.com) to copy files from my Windows 10 PC to a Synology drive with 50MB/s. The TeraCopy process does not show up in the process list of NetMaster. NetMaster also shows no other process that has such a big transfer rate. Is it because this is a local file transfer?