There should be a latch where the door attaches to the track. Disconnect it then deadlift the door.
Discussion
I have to reconnect the cable to the pulley. I already did disconnect the latch to even out the door on the ground.

I'll have to reconnect the cable to the pulley, then adjust the tension.
Until I do, I won't be able to open up the door manually. It's too heavy to keep it up.