1971 door glass removal help.

Im having a hard time getting the glass to detach from the front rail that goes up and down inside the door. I’ve got all the other parts out. Lock, handle, window crank ect.
That front track should unbolt. I think the bracket on the glass hooks around that front track. You might just be able to unhook it if you move the glass forward enough. I always just pull all the parts loose to get more movement on the glass.