38 C.F.R. § 3.156(b) / Beraud v. McDonald, 766 F.3d 1402 (Fed. Cir. 2014) / Lang v. Wilkie, 971 F.3d 1348 (Fed. Cir. 2020) 38 C.F.R. 3.156(c) provides that any new and material evidence received prior to the expiration of an appeal period in the legacy system “will be considered as having been filed in…