UNC file paths are a Windows thing. \\TITANSERVER\Series makes no sense on non-Windows platforms. The console output will tell you as much.
You need to mount the remote SMB server into the local file system. If you use Gnome or KDE, then accessing a remote network share via the UI will automatically mount that share into the local file system, usually in /media or perhaps ~/gvfs or elsewhere depending on your chosen Linux distribution and Desktop Environment. Please Google "how to mount smb share on raspberry pi" for details.
tl;dr in Windows terms, you need to create a mapped network drive first. You can specify the log file by specifying the absolute path to the log file, like exactly what you're doing already, except with Unix file paths instead of Windows file paths:
Shell: Select all
--log-file "/path/to/log.txt"