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Use only transparencies designed for use in laser printers/copiers.!!
If you print on any other materials than ordinary A4/A3 paper you must select the print settings when creating a print job.
In other words, depending on the application, a window like the one below will open under Printer Properties or Preferencies:
In Paper Source, select Bypas Tray and in Paper Type, select the desired material - e.g. Transparency as in the picture.
That is all in principle. Click OK and in the application, click Print and you print job is sent to the printer.
Double-sided
You can print double-sided when using the bypass tray. Once again, go to Printer Properties and Finishing tabs.
Select 2-sided Printing and the desired direction, below. In the picture book bind is selected.