Form To Tray Assignment Options are embedded parameters and/or commands in the AFP docs (document, page segment, overlay, or medium overlay) to match the correct paper size with each paper source available on the target printer.
A full list of available paper sizes.
A complete list of valid paper sources available on the target printer. If the "Auto Select Bin" option is selected, Paper Type is matched to Size to determine the media object identifier.
White, Color, Transparent are the three available options.