Mate.Helpers.copy_to

You're seeing just the function copy_to, go back to Mate.Helpers module for more information.
Link to this function

copy_to(session, src, dest)

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Specs

copy_to(session :: Mate.Session.t(), src :: String.t(), dest :: String.t()) ::
  {:ok, String.t()} | {:error, String.t()}

Copy a file from your local machine to the remote server