Maybe you found the solution already, if not: The trick is to locate the logo files in a folder named "www" and your YAML should look like that

---
title: "Palmer Penguins"
author: "Quinten"
format:
  dashboard:
    embed-resources: true
logo: www/penguins.png
theme:
  - zephyr
---

Then you will get a quarto dashboard with logo: