Lovely machine - well done!
If the fabric isn't feeding through it could be that there is insufficient pressure from the foot, so tighten the screw at the top at the back - do a few clockwise turns and see if it improves. This will give greater compression of the spring on the pressure bar, so when you put the lever down the foot should come down harder and give greater grip. It looks as though it has already been tightened during the cleaning process.