PMS has problem adding a movie placed by radarr.
The path of the file is:
[movie root]/Driven (2018)/Driven (2018) {imdb-tt5592796} [WEBDL-1080p][h264][8 bit][AC3 5.1][EN]-[EVO].mkv
Please help me fixing it. Many Thanks.
Use only one pair of square brackets in a file name. Plex will only ignore the contents of the first pair of [ ].
Change the file naming pattern accordingly.
Verify that the file is actually a valid video file and plays in a regular desktop video player.
Then perform the Plex Dance.
Ensure that download and decompression/remuxing etc are not performed in a folder which has been added to a Plex library.
Only place the file into a foldr monitored by Plex, when it has been prepared fully.
Thanks for your reply. I have renamed the file to either:
[movie root]/Driven (2018)/Driven (2018) {imdb-tt5592796} [WEBDL-1080p h264 AC3 8-bit 5.1-EVO].mkv
or
[movie root]/Driven (2018)/Driven (2018) {imdb-tt5592796}.mkv
Neither helps.
I am sure the file permissions and the content are correct. Sadly it is the only movie not showing up in Plex. 
Enable the Duplicates filter in your library.
Then look at the Plex media info of any duplicate it may show you.
At the top, there should be two (or sometimes more) file paths and filenames. Maybe your freshly added movie is among these. If you find it, Split the movie, then perform Fix Match on each of the duplicates. Use again the Plex media info tell which is which.
If your server is Linux-based, always look at the file access permissions as well.
Particularly, if the media files are added automatically by other apps. Each of these apps might be running under a different user account. Resulting in the ownership and access permissions of the media files potentially being different, from what they would be if you copied them there yourself by hand.
I just created a test folder/video file with the structure and names as your first entry and it was picked up. So the naming shouldn’t be a problem.
Thanks for your tips. You helped me eliminated a few duplicates. Unfortunately, it was not recognized as a duplication.
Let me keep digging…
Thanks for confirming the name is the culprit. Let me keep digging.
It turned out should be some strange permissions issues. I am not sure which but they are fixed now. Thank you.
