There’s a thread where other users explain how to manually upgrade the PMS on a QNAP
As for the actually installed version – please check Settings > [Server Name] > General not Settings > Plex Web > General. The latter will only show you which version of the web app you’re using – this will be different depending on if you’re accessing the server from https://app.plex.tv/desktop or through its local IP address (e.g. http://[QNAP IP address]:32400/web). The hosted version (https://app.plex.tv/desktop) is currently version 4.65.1 of the web app while the very latest beta bundled with the Plex Media Server (e.g. http://[QNAP IP address]:32400/web) is using version 4.63.0 – older versions of the Plex Media Server have bundled older versions of the web app.
