Start here:
In the override file
[Service]
Environment="PLEX_MEDIA_SERVER_TMPDIR=/path/you/want"
This is not the same as the Transcoder Temp Dir which you set in Preferences.
NOTE: To clarify, on SYSV Linux systems, I map TMPDIR or TEMP or TEMPDIR to PLEX_MEDIA_SERVER_TMPDIR for PMS.
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