Hey there, dboyll.
I'm happy to see you reaching out to the Community. I'm here to assist you with your invoice concern.
When sending an invoice, it'll prompt the Send email screen for you to configure the subject and body (see screenshot below). Once you click the Send and close option, the transaction will be sent directly.
Right now, the option to add an extra prompt when sending an invoice is unavailable. We'd love to hear your feedback about what works best for your business. With that said, I recommend you send feedback by clicking the Gear icon and selecting the Feedback option.
I'm looking forward to your response about this feature. In case you need anything else, please let us know by posting a comment below.