title: Trying to make a TCPDF generated PDF file automatically print to letterhead tray
body: <p>I am generating invoices with TCPDF and everything is working fine. The pdf files need to be printed onto letterhead paper. I couldn't find any information on this, but is it possible to set a "letterhead" paper type in the pdf document so that when printed it will automatically choose the tray with letterhead paper (of course, the printer has the ability to set what kind of paper is in which tray)?</p>