Icon change for VLC snap on 18.04

I would like to add a vlc-symbolic.svg icon for VLC player to appear on the top panel. Normally, it would be enough to add one to the symbolic folder in icon theme. Maybe because it is installed as a snap package, it is not working for me. The same goes for VLC icon as well.

Does anyone know how to change it for snap ? I am using Ubuntu 18.04. Thanks.