Server Version#:Truenas scale -truecharts 1.30.0.648_12.0.8
Player Version#:9.13.1.37459
I installed plex on my new server running truecharts version of plex. I see thumbnails If I access it through the web, windows, Iphones, but not andriod mobile devices i.e galaxy s21, lg velvet, Nvidia Shield. I have however seen Thumbnails on a Samsung smart tv. App - Plex for Samsung, client version - 5.52.3 ,Platform version - 5.5. I’m wondering if this has hapened to anyone else
Following…Same issue for me. Running on Unraid
I just uninstalled Plex and started over still no thumbnails even as its starting to scrape. Online I see pics but not on my Nvidia shield or phone
Same issue here. I’m using linuxserver/docker-plex on an Unraid box and no covers and backdrops appear on any of my android mobile devices, even though when accesing Plex via app.plex.tv, everything is fine. Everytime pics fail to load in android app, something like this appears in my Unraid syslog:
Apr 10 20:10:52 Dialga nginx: 2023/04/10 20:10:52 [error] 29566#29566: *39636818 open() "/usr/local/emhttp/library/metadata/21667/thumb/1680307268" failed (2: No such file or directory), client: 127.0.0.1, server: , request: "GET /library/metadata/21667/thumb/1680307268 HTTP/1.1", host: "127.0.0.1"
Apr 10 20:10:52 Dialga nginx: 2023/04/10 20:10:52 [error] 29566#29566: *39636818 open() "/usr/local/emhttp/library/metadata/21677/thumb/1680307236" failed (2: No such file or directory), client: 127.0.0.1, server: , request: "GET /library/metadata/21677/thumb/1680307236 HTTP/1.1", host: "127.0.0.1"
Apr 10 20:10:52 Dialga nginx: 2023/04/10 20:10:52 [error] 29566#29566: *39636818 open() "/usr/local/emhttp/library/metadata/21678/thumb/1680307245" failed (2: No such file or directory), client: 127.0.0.1, server: , request: "GET /library/metadata/21678/thumb/1680307245 HTTP/1.1", host: "127.0.0.1"
There is no /usr/local/emhttp/ directory in my Plex docker image, as my Plex library is located in /config/Library/. There is /usr/local/emhttp/ directory in my Unraid system, but with no library subdirectory. There are also no files like 1680307268, 1680307236, 1680307245 or directories like 21667, 21677, 21678 anywhere in my system or Plex docker image.
On the other hand, all above mentioned missing files are accesible via Plex web server on adresses like http://192.168.0.101:32400/library/metadata/21678/thumb/1680307245.
There is nothing suspisious in my Plex android app or Plex server logs, so the problem seems to be related to the fact that my Plex android app is for some reason trying to get Plex images from the Unraid system instance of nginx (I have no separate nginx docker installed), instead from the web server provided by Plex on the port 32400 
.
I can play anything via direct stream on any of my android devices and missing pictures is my only issue with the Plex android app. I see all pictures when accesing Plex via web or via Plex Samsung TV app.
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