Why did a strange ".local-install" file suddenly appear in snaps folder?

/var/lib/snapd/snaps/.local-install-959384086 170.8 MB Binary
Fri 07 May 2021 07:14:40 PM ADT -rw--
(Type: "Squashfs filesystem")

I'm not aware of doing anything to invite this auto-download. Can anyone enlighten me as to what this is or whether it's needed? I'd like to remove it. Thanks