QB Issue Resolution:
There are two different ways to access the option to import a logo. If you don’t have a customize button under preferences, then you’ll need to access the settings another way.
Pull up an invoice
At the bottom center click on Customize.
Under the Style tab click on Upload to import your logo.
Resolution for Issue 'How to add company logo?' available: Yes (Solved).
Source: Intuit Community forum.
How to add company logo?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.Support for Company
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Error Recovery for Company [Canada]
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