hello. My name is***** can help you with your question.
Please remove the trees completely and check inside for any stuck paper or anything displaced inside the printer. Then with the printer unplugged, turn it over and give it a little shake to make sure there are no foreign items in the printer and then try inserting the 2 trees. If you still cannot insert them and are having a problem with it, it may be best to take a picture of what you're seeing and attaching here using the paperclip icon. That will allow me to see exactly what you're seeing and may allow me to better diagnose the problem.
Is there anything behind the printer? Trays can extend past the back of the printer.
The pictures aren't very clear. Is there something physically in the way of the tray going in?