Button card, picture instead of icon

I’m trying to get a tv remote going in a panel. I got an IR transceiver connected via tuya, each channel turns up as a scene in HA. I have set up several 3-button cards with each button linked to a channel. So far so good. Now I would like to get the channel logo showing instead of an icon. After googling to the best of my abilities I have come up with the following, but it’s no good.

Appreciate any pointers you guys might have.

show_name: false
show_icon: false
type: button
entity: scene.svt_ett
entity_picture: /local/kanalloggor/svt1.png
tap_action:
  action: call-service
  service: scene.turn_on
  target:
    entity_id: scene.svt_ett