Apologies if this is an easy question for my first post, searched the forum and could not see it raised/answered. I ripped my DVDs to a Synology NAS and Plex has generally worked well/been easy with titles/authors automatically picked up. However I have some lesser know DVDs (E.G. Amberley Marine on Boat Radars, but there are others) that don’t appear under “All Shows” view and when I try to access them via the “By Folder” is says “No items available”. The files are there as below.

It must be something obvious but I can’t see it! Thanks in advance, Peter

Peter