If you need to CC someone to your invoice, or to be able to send it to multiple recipients simultaneously; then the best way to do this is to use the carbon copy email. The carbon copy email is an exact copy of the email that your client receives, containing your invoice PDF attachment. It is always simultaneously sent to your own email address, whenever you send an invoice to someone through the app. Please note: this carbon copy email will always go to the email that you used to register your Albert account with. If you wish to send it to all your recipients at the exact same time, then the simplest thing to do is to send the invoice to yourself from within the app. Please note: by doing this, you will receive two copies in your email inbox, the original and the carbon copy, so you can use either email, as they are both exactly the same.
So simply forward either one of these emails onto your client(s). You can also attach any necessary or additional files in the process.