It is possible to insert cards the wrong way up, in general the wax on the card should face up as you look at it from the drivers seat.
A hinged analogue will fold open and the rear of the chart sits on the chart table, you can then see the stylus or stylii.
On an analogue cassette it still goes wax face up for driver 1 and beneath the separator plate for driver 2
ps.
I think there used to be some stipulation that you or the ministry were able to open the head without removing the card to view the trace. Long gone also.