To view the Invoice PDF using the Web Portal, go to CRM > Invoices > Select the View PDF symbol for the invoice that you would like to view.
Alternatively, if you have the Invoice open, you can click on View PDF at the bottom.
To view the invoice PDF in the App go to Accounts > Invoices > Select the Invoice that you would like to view > View (at the bottom of the invoice) and the PDF will open.
Invoices can also be viewed through the CRM Contact card and also through the Job that the invoice is connected to.