It looks like "Extra" is a reserved word, so my Extraterestrial movie folder entitled "Extraterrestrial.2014.720p.DD5.1.H264" is simply skipped on the library movie scan until I prefix the folder name with any character e.g. X
I wanted to report, and I think I am doing it correctly according to https://support.plex.tv/hc/en-us/articles/201643703-Reporting-issues-with-Plex-Media-Server?
Seems simple when I have figured it out, but it tooks a while!
Thanks