Being able to attach a pdf to emails when sending invoices, this would be so handy for receipts/reimbursements if at the send stage of the process you can attach either a file from the files section or upload from desktop to attach.

I'd like to be able to add attachments and screenshots directly to an invoice, not as part of the email that goes out. With screenshots, I'd like the use of short keys to add them in. This would be added to the end of the invoice.

I'd like to be able to add an attachment to invoices. I have clients that require additional items when I send them their invoice.