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We have a few things to check to make sure you're able to add your logo, nicoleb.
First, your file must meet the following requirements before uploading it to QuickBooks Online:
Second, open the logo with Paint (or Preview on Mac) in case you're unable to upload the file. Then, re-save it as a .jpg file and rename it. Once saved, upload the logo one more time.
Let me know if you have other questions. I'm always here to help.