ction bears the burden of proving each element of privilege and a lack of waiver. Osorio, 75 N.Y.2d at 84, 549 N.E.,2d at 1185 (citations omitted); Egiazaryan v. Zalmayev, 290.F.R.D„-421, 428 (S.D.N.Y. 2013). "Such showings must be based on.competent.evidence, usually through affidavits, deposition testi