Tethering factor involved in autophagy. Involved in autophagosome maturation by promoting the autophagosome fusion with lysosomes. Binds phosphatidylinositol-3-phosphate (PtdIns(3)P) present at the surface of autophagosomes (By similarity). Localizes to Lysosome membranes, and binds PtdIns(3)P at the surface of autophagosome. Localizes to autolysosomes, a vesicle formed by the fusion between autophagosomes and lysosomes (By similarity). The PH domain mediates the binding to phosphatidylinositol-3-phosphate (PtdIns(3)P). Belongs to the TECPR1 family.