I am running Plex in a docker container. I have mapped the /data volume out of the container (standard stuff -v /plex/library:/data). I have a movie file inside my library folder which is named as mission-impossible-fallout.mp4 . This file shows even when I choose the media folder for the library through the Plex web UI. (see the attached image):

Still after that my library shows ‘There are no items in this library’. Any idea what is happening?
Here is the scan log for reference:
Dec 31, 2018 13:09:08.777 [0x7fb2c8fff700] INFO - Plex Media Scanner v1.14.1.5488-cc260c476 - Docker Docker Container x86_64 - build: linux-ubuntu-x86_64 - GMT 05:30
Dec 31, 2018 13:09:08.778 [0x7fb2c8fff700] INFO - Linux version: 4.4.0-141-generic, language: C
Dec 31, 2018 13:09:08.778 [0x7fb2c8fff700] INFO - Processor Intel(R) Atom(TM) CPU C3955 @ 2.10GHz
Dec 31, 2018 13:09:08.778 [0x7fb2c8fff700] INFO - /usr/lib/plexmediaserver/Plex Media Scanner --scan --refresh --section 5
Dec 31, 2018 13:09:08.777 [0x7fb2d4830800] DEBUG - Opening 20 database sessions to library (com.plexapp.plugins.library), SQLite 3.13.0, threadsafe=1
Dec 31, 2018 13:09:09.064 [0x7fb2d4830800] DEBUG - Scanning Films using en(Plex Movie Scanner) with 0 current media items and 1 section locations in the database...
Dec 31, 2018 13:09:09.065 [0x7fb2c77ff700] DEBUG - HTTP requesting GET http://127.0.0.1:32400/:/metadata/notify/cullTimeline?librarySectionID=5&sinceTime=1546240749
Dec 31, 2018 13:09:09.069 [0x7fb2c77ff700] DEBUG - HTTP 200 response from GET http://127.0.0.1:32400/:/metadata/notify/cullTimeline?librarySectionID=5&sinceTime=1546240749
Dec 31, 2018 13:09:09.226 [0x7fb2d4830800] DEBUG - Performing a scan with 'Plex Movie Scanner' (language: en virtual: 0).
Dec 31, 2018 13:09:09.226 [0x7fb2d4830800] DEBUG - * Scanning /data
Dec 31, 2018 13:09:09.227 [0x7fb2d4830800] DEBUG - * Scanning directory /data (parent: no)
Dec 31, 2018 13:09:09.228 [0x7fb2d4830800] DEBUG - Adding file for scanner: "/data/mission-impossible-fallout.mp4"
Dec 31, 2018 13:09:09.230 [0x7fb2d4830800] DEBUG - Skipping over directory '', as nothing has changed; removing 0 media items from map.
Dec 31, 2018 13:09:09.238 [0x7fb2d4830800] DEBUG - Removing 0 media items that were left.
Dec 31, 2018 13:09:09.239 [0x7fb2d4830800] DEBUG - Removing 0 directories that were left.
Dec 31, 2018 13:09:09.243 [0x7fb2d4830800] DEBUG - Refreshing section 5 of type: 1
Dec 31, 2018 13:09:09.245 [0x7fb2c518c700] DEBUG - Refreshing 0 IDs.