Hi @Bolz
The CC emails are sent to the administrator of the account. This can be changed in Account Settings >> Team Management, if required.
Unfortunately not at this time. The PDF file name is generated to be unique but related to your account, which can’t be customised at this time.
There is an active feature request for this here: PDF Filenames Convention
There’s a bit of discussion there too, which includes some comments from my colleague.
You can configure QuickFile to send overdue reminders: Automated overdue invoice reminders
These will generally include a link to the invoice too.
Hope this helps!