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We have a reported issue about this, Laura06.
Our product engineers are investigating the problem you are experiencing when uploading a logo to QBO. For now, I'd recommend to give us a call so that you'll be added as one of the affected users.
The steps below will walk you through contacting them:
Once the issue is fixed, you can check this article. It contains information on how you can successfully add a logo to QuickBooks.
Post again here if you have other questions with QuickBooks. I'm always here to help you figure them out.