Docker Plex on Ugreen DXP4800 Pro - No automatic library update

Plex Media Server
,
1

Server Version#: 1.43.1.10611
Player Version#: 2026.5.0

Hello everyone,

I migrated my Plex docker image from my old QNAP NAS to my new Ugreen DXP 4800 Pro NAS. Everything works fine but the automatic refresh on changes within the library doesn’t function on the new NAS. A manual refresh works well. The library is hosted directly on the NAS device and the option for the automatic update is activated.

I already talked to the Ugreen developers and they said it must be a problem with the container or Plex itself. So I opened a Github issue. The maintainer of the container and the Ugreen support did participate but couldn’t really find the issue.

You can find the issue here

Ugreen stated that inotifywait and stats of file changes are shown correctly within the container but they need additional information when and how Plex handles the automatic library update.

It seems that I’m not the only one with this problem:

https://www.reddit.com/r/UgreenNASync/comments/1miq0pu/plex_in_docker_on_ugos_not_autoscanning/

I hope someone could point out what part is not working correctly so I can communicate this with the Ugreen support.

Thank you very much for your help.

Markus

2

I have a Ugreen DXP480Plus and followed their official instructions here. The only change was to add the Plex official docker container to the repository list.

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Scan my library automatically is enabled and working as expected. Not sure if the difference is using Docker compose vs setting up through the webUI.

Here is my volumes:

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If a manual scan is working then you have the current permissions. :thinking:

Can you please do the following:

  1. Confirm server DEBUG logging is enabled, VERBOSE logging is disabled.
    SAVE if changes.
  2. Restart PMS
  3. Give it two minutes to start and stabilize
  4. Add content to a library’s path
  5. Wait minutes for Plex to automatically scan in file
    • If it does not scan in automatically manually run a library scan
  6. Confirm added file is seen by Plex (added to Library)
  7. Download the server logs
  8. Attach the logs so I may see them.
3

Hello Atomatth,

thank you very much for your support.

I did the following steps:

  1. Moved one file out of my library
  2. Triggered a manual rescan
  3. Activated debug log
  4. Restarted the Docker container
  5. Waited some minutes
  6. Added the movie back into the library
  7. Waited some minutes –> movie didn’t appear
  8. Triggered a manual scann –> movie appears

If I can do anything else then please let me know.

Plex Media Server Logs_2026-04-13_16-25-01.zip (913.6 KB)

4

Can you please try to use our official docker container? https://github.com/plexinc/pms-docker

Also, could you follow the Ugreen instructions for setting up our container through their webUI?

5

Hello Atomatth,

thank you again for your help.

As asked I tried to set up the plex docker container following the Ugreen instructions via the GUI (sorry the article is in german: https://nas-de.ugreen.com/blogs/how-to/plex-auf-ugreen-nas-einrichten). The articles uses the docker image from Linuxserver. I tried the official pms-docker from you as well as linuxserver/plex following the instructions. Both variants work fine but the automatic refresh is still not updating on library changes. To be sure the problem is not related to my Plex configuration I set both up freshly with no pre-existing configuration, added my library folder and activated the automatic refresh.

7

Thank you for reporting, I’ve created an internal issue for tracking this.

How long? What client are you using to view your library, I’m assuming web (app.plex.tv or the bundled web app), but just want to be clear. Could you also share a screenshot of your Settings > Library page (where Automatic scanning setting is) and/or share your Preferences.xml (this contains your email address and token information so please DM)?

8

I’m not sure this is a Ugreen-specific thing. I just found out the automatic library update stopped working on my Plex install (Archlinux from the AUR, no docker). It’s been working for years without issue, but for the first time ever I had to manually click scan libraries for a movie to show up.

I updated on the 10th of April: 1.43.1.10576-1 → 1.43.1.10611-1, not sure if its been broken since the 10th. If its save to downgrade, I can try to downgrade and confirm the old version still works.

9

Good Morning Atomatth,

I waited approximately 5 minutes before running the manual refresh. If this is to short, I can repeat it with a longer waiting time.

To access the Plex I use the web interface via the local web app.

Here is the requested Screenshot

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I’ll send you the Preferences.xml in a few minutes.

Thank you for your help.

10

I’ll politely back out of this thread, I set DEBUG and restarted PMS and added new media, but this time it worked… not sure why it wasn’t working yesterday but I can’t repro the problem.