When running in service mode (- controllservice), the system cannot transfer files after being locked? The current version used is the latest version: tigtvnc-2.8.81-gpl-setup-64bit.msi. There may be an error message: Error: failed to get file list in remote folder '/', but in user mode (- controllapp), file transfer can be performed even if the system is locked!
This was changed in 2.8.75:
Server for Windows: Blocking file transfers while the system is locked.