Hi, orangeremovals.
You can add your company logo to invoices through Custom Form Styles and set the saved invoice template as the default.
Here's how:
- Go to the Gear icon, then select Custom form styles.
- In the upper-right corner, click the New style dropdown arrow, then choose Invoice.
- Under the Design tab, select Make logo edits.
- Click Add a logo, upload your company logo, and choose your preferred Size and Placement on the invoice.

- Hit Done, then set the saved invoice template as your default invoice.

To confirm the logo appears, select the Print option in the invoice section.
For more details on customizing logos in invoices, you can check out this article: Add, customise, or remove logos on sales forms.
Should you have any concerns, feel free to reply in the thread.