Clutch problems

Mine did the same thing ................. when I tore all the teeth off the front drive , lol.
If it was mine,
I would prove that the input is turning with the drive shaft, in every gear, and if it is then the trans has to come down, to examine the clutch. You might be able to see the input thru the bellhouse bottom cover or the TO window.

But if it isn't turning, then the sidecover has to come off for a look. I mean you mightta broke a fork