My mother purchased a special all-in-one unit (brother MFC-8910DW) for the purpose of printing very large PDF files with mixed legal and letter pages. On windo

My mother purchased a special all-in-one unit (brother MFC-8910DW) for the purpose of printing very large PDF files with mixed legal and letter pages. On windows, Adobe Reader + the printer driver handle selecting which paper tray to pull from depending on the page dimensions in the PDF. But on MacOS and Linux, I had no such luck (using both the built in PDF viewers and Adobe Reader). I am unsure if this is a cups feature that is missing from the driver, or some other limitation. Otherwise, the unit's basic functionality worked fine(though I have the scanner set up so it emails a PDF file using the printer's built in SMTP client). I was really hoping to get my parents on Linux but between this issue and a program that my dad uses that doesn't run on wine, I (for the time being) left them on Windows 7. (I had both of them go out and buy new laptops in the last year or two since both prefer 17" screen sizes, which seem to be going by the wayside and Windows 7, which was getting harder to find computers with win7 oem licenses.)