UPDATE 2-Dropbox's $7 bln IPO is a third from peak valuation
March 12, 2018 at 13:01 PM EDT
March 12 (Reuters) - Dropbox Inc on Monday filed to go public, valuing the cloud storage company at up to $7.1 billion, nearly a third below a valuation three years ago, as concerns rose that it was not growing fast enough to justify a loftier price tag.