Load collections tags from file (nfo) next to movie file

the only thing that Plex can read currently from an NFO file is the IMDB ID tt1234567

There is a third party agent that can be used to load NFO files in to Plex.
for movies XBMCnfoMoviesImporter
for shows XBMCnfoTVImporter

the NFO file must be in the format that XMBC could load…
search Plex forums on where to get them…

I use them myself…
Easiest way to load the correct information into Plex

You can get them to load collection names with the movies but not anything else.
that I am aware of…