Hello, @uros.
I understand the importance of being able to make invoices appear as a PDF attachment when sending them to customers. This option is currently unavailable, however, you can temporarily follow the steps provided by RCV above to o manually export the invoices as a PDF file in QuickBooks Self-Employed (QBSE) before sending them to your clients.
I also encourage visiting our blog to stay current with the latest QuickBooks news and updates.
Let me know if you have any other questions. I'm a few clicks away to help. Have a good day!
