Custom card icon?

I’m trying to use a custom icon for a card (tab) button. I’ve tried the below at the beginning of the card setup and it’s just coming up as blank, the file is in the www folder. Are there file type limitations?

  - icon: /local/downstairs.svg

Try /config/www/downstairs.svg

Assuming that is where you put it.

Full path for everything except URLs (which use /local for the www folder).

I think you’re right on the address. I went into the docker and can see the file as /config/www/airbnb.svg. Unfortuntaley, it not showing the icon as desired. Right now it’s just a blank space. I’ve tried both svg and png files.

Any solution on this?