How to make invoice number show up in email subject line of invoice in QBO?
How can I make the invoice number to show up automatically in the subject line when sending an invoice or estimate email to clients?
I tried to make it work by adding "<NUM>" in my subject line of my email, but it won't work. I tested it by sending an email to myself and see if it would work, but it still won't show up with the invoice number.
Please anyone who can help with this. I would appreciate it! Thank you!
Below screenshot of sending an invoice email.

