Is there a way to include receipts with my invoice?

Warm welcome, luminaryconsulti. I understand that you are interested in including receipts in your invoices.
 

Currently, attaching receipts to invoices is unavailable in QuickBooks Self-Employed. I see the advantage of this feature, so I'd recommend sending feedback to our product development team. 

To send a feedback: 

1. Hover to Invoices, then select Create invoice.
2. On the upper left side, click Feedback. 

See the attached screenshot for visual reference.

On the other hand, if you have receipts on your mobile device, you can email images of your receipts to QuickBooks Self Employed. QuickBooks scans the images and enters the details for you. 

My support is always available for you, luminaryconsulti. Kindly tap the reply button and type in your response if you need further clarification about adding receipts to your invoices.