Apologies - slow in getting back to you - family commitments!
Ran Plex and seems to be working.
When I said containers what I should have said is I haven't as yet set up all of the folders for Photos / Videos etc etc I need to get back into the same place as that where I listed the PUID, GID, etc and add them there.
Thanks to you I've got something working - albeit I don't really understand what or how.
Not sure about security - get a message saying not a secure connection?
In any event have to pack it in for tonight to keep the peace.
Once again my gratitude for your skill and support
best