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The paper lead needs to go under the metal bar, then pulled up to the windup spool.
With the back open, wind the take up spool just enough to ensure the paper is securely attached. Close the back and just wind until "1" appears in the exposure counter and the wind locks.
The metal bar will detect the added thickness of the film as you wind and engage the film counter automatically. This is a convenient luxury feature unfortunately not found in modern twin lens rolleis.