It should show on the front panel of the printer.
If it is not, that is an indication of an internal hardware problem (bad sensor or control board), which is likely the underlying issue of why it will only default to the manual tray as well, because it can't detect the primary tray.
Open it up, remove the paper supply, and blow the inside out with compressed air.
Fan the paper stack, replace it,
Then reset the machine:
unplug power at the wall outlet
wait 5 minutes
press and hold the power/on button for 60+ seconds
keep holding while plugging back in, and for another 60 seconds after, then release
Let me know the results, and I’ll advise further if needed.