Yes, you can download the active bill PDF from the bill details.
See below for an example of the downloaded file.
Yes, you can download the estimate PDF from the draft bill details.
See below for an example of the downloaded file.
Yes, you can download an approval record from the active bill details.
See below for an example of the downloaded file
Yes, you can download payment advice.
Yes, there are a couple of ways that this can be done:
Via custom fields - See Custom Fields for more information.
Adding a logo to your customer credit note - You can do this by setting a unique logo in PDF Templates. Head over to Settings > Templates > PDFs > Choose a Template > Header > Upload Logo.
The downloaded PDF will display amounts in bill currency.