In addition to moving Local Media Assets to the bottom of the list, consider using Plex’s recommended naming convention.
The recommended way to name movies for Plex is Movie (year).ext. Adding the extra information to the file name increases the likelihood of a mismatch or no match. If you wish to keep it, put the info in square brackets, as Plex ignores such info: Movie (year) [other stuff].ext.
Instead of The.Peanuts.Movie.2015.1080p.BluRay.H264.AC3.mp4
Use: The Peanuts Movie (2015) [1080p.BluRay.H264.AC3].mp4
See this post for details on how Plex matches movies and how the extra information can mess up the process.
Plex recommended media naming and organization guidelines: Your Media.
