Nov 1 (Reuters) - Brazil’s Nubank on Monday lifted the veil off its filing for an initial public offering in the United States, revealing a big jump in revenue for the nine months ended Sept. 30, less than a week after the fintech company said it had confidentially filed its IPO paperwork with regulators. (Reporting by Niket Nishant in Bengaluru; Editing by Shailesh Kuber)