Plex is dumping hundreds of jpg files into tmp folder. Can this location be changed?

[ChuckPa]

If you look at the variables defined in /systemd/system/plexmediaserver.service,

you can override them in a customization file for your system.

Linux Tips

Customizing your Plex configuration on systemd based systems This information is intended for those systems where cat /proc/1/comm returns systemd. On systems which use Systemd (Ubuntu 16+, Fedora, Centos 7, Debian 8,) you create this customization file which SystemD reads prior to launching PMS. This file is independent of the default configuration and service control mechanisms in /lib/systemd/system/plexmediaserver.service. Your customization override is preserved across updates, uninstal…

Moving the TMPDIR is common.