External SRT files not working with Samsung BD E-8500 PVR

Hi
can anyone advise how to get external .SRT subtitle files working with Samsung player BD E-8500 running with Serviio on Windows 7 (32) ?
Any help appreciated
Thanks in advance
David
can anyone advise how to get external .SRT subtitle files working with Samsung player BD E-8500 running with Serviio on Windows 7 (32) ?
Any help appreciated
Thanks in advance
David