I just installed a new Brother dual tray printer and am having difficulty getting my PDFs from Adobe Reader to print on the proper-size paper. My files always have a mix of letter and legal and I expected the file to AUTO DETECT. Brother Support says my machine and computer are set up correctly & that it's an Adobe issue. Adobe Support tells me that Reader does not have that capability and I must upgrade to PRO to print as I wish. ?? Is this true? I'm on a Mac desktop.