QB Issue Resolution:

there used to be a setting in company settings that allowed you to check mark to send a copy to yourself, with this new improved version of QBO I can not find that setting

you will have to add your email addy manually as far as I can see

Resolution for Issue 'How do I get a copy of the estimate or invoice sent to my email when I send it out to my customers?' available: Yes (Solved).
Source: Intuit Community forum.

How do I get a copy of the estimate or invoice sent to my email when I send it out to my customers?: 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.

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