(amd64)ubuntu@localhost:~$ hello-world.env |grep TMPDIR
SNAPP_APP_TMPDIR=/tmp/snaps/hello-world.canonical/1.0.15/tmp
SNAP_APP_TMPDIR=/tmp/snaps/hello-world.canonical/1.0.15/tmp
(amd64)ubuntu@localhost:~$ ls /tmp
snap.0_chatroom.ogra_B5p6S0
snap.0_go-example-webserver.canonical_ID8XL2
snap.0_hello-dbus-fwk_vj56JR
snap.0_snake.mectors_yJcka2
snap.0_webdm_DumxTT
snap.1000_hello-world.canonical_IWGI04
snaps
systemd-private-2a2f7e185b6241d89441d663c40a8c33-systemd-timesyncd.service-7zXToW