Plays a role in vesicular protein sorting (By similarity). Component of the membrane-associated retromer complex which is essential in endosome-to-Golgi retrograde transport (By similarity). Component of the retromer complex, composed of VPS26, VPS29 and VPS35 (PubMed:29654975). As part of the retromer complex, interacts with the sorting receptor SORTLR/sortilin (PubMed:29654975). Interacts with GTPase RAB7 (PubMed:32512169). Belongs to the VPS26 family.