Skipped files summary

There is no such report, except maybe in the logs, but unfortunately not in a concise, well readable manner.
The linked article has a link in turn with a list of all the “reserved” words.

I also wrote up this post once, maybe it can shed some additional light on the issue and what file names to avoid: How to find the discrepancy between number of files on disk and the number of movies in the Plex movie library