0xFeedBeef
Ok, I wanted to post my findings.
First, some users feel it does not work because we get the popup below:

But I just click “ok,” and I can add several movies fine.
Once queued, they download.
With Plex, manual analyze, as far as I recall, NEVER worked.
You have to have auto-analyze on.
I myself find for me it works better using app.plex.tv (Plex App) than the (Plex Watch) option.
Most items may need mkv(mkvtoolnix) and some might work with MP4.
Using MP4 tends to have out-of-sync audio on Plex downloads.
Shows are now tested and working too. My testing was all with mkv(mkvtoolnix)