You have a number of options to send a message with invoice file attached to a client.

From the invoice list or invoice editing form, select necessary invoices and click Message to client(s) button:

Depending on you selection, application can generate a message with invoice (and optionally attach invoice PDF file), payment reminder, or other message to a customer.

If you select Invoice, application will check if invoice PDF file exists for a selected invoice or not. If it does not exists, invoice file will be generated automatically and attached to an invoices and generated message.

In the result, you will see message generation window:

From here you can View generated message to make some corrections in the text, Preview them, or click Send or Send all buttons to send messages. Click Save and close to save e-mail message.