I know a way, @tanztoku.
Before that, let me share information that adding a company logo in QuickBooks Online is only available on an Invoice, Estimate, and sales receipt.
You can utilize a third-party application or consider downloading the credit note form and then manually add the logo. However, you’ll need to use your email provider when sending them.
Here are the steps:
In case you want to create more personalise and effective ways to enhance your business brand. You can visit these resources here to learn how to import and customise invoices, estimates, and sales receipts in QuickBooks.
If you need further assistance with any instructions I’ve mentioned, just let me know. I’ll get back to you as soon as I can.