just realised that stone can't be smelted.. my bad..

but how can I pick up things laying on the ground?

Hey. I'm in the campaign, I put down a Burner Mining drill going to Transport Belt, which goes to the burner inserter. The burner inserter can pick it up, but it won't place it in the stone furnace?
I have placed it just like it is another place (it was there when I spawned), and it still doesn't ...