When opening ODIN I get the following notification:
Update Error
ENOENT: no such file or directory, open '/snap/odin-c2is/15/-
resources/app-update.yml'

A directory /snap/odin-c2is/15/resources/ exists, but indeed does not contain a file named app-update.yml. I also don't think the auto update feature has ever worked for me, I've had to manually update ODIN to newer versions.
I'm on Ubuntu 20.04.4 LTS, and have installed ODIN via snap: sudo snap install odin-c2is. I'm currently using ODIN 0.18.1, but I have noticed this error message on older versions as well.