Component of the FTS/Hook/FHIP complex (FHF complex). The FHF complex may function to promote vesicle trafficking and/or fusion via the homotypic vesicular protein sorting complex (the HOPS complex). FHF complex promotes the distribution of AP-4 complex to the perinuclear area of the cell. Component of the FTS/Hook/FHIP complex (FHF complex), composed of AKTIP/FTS, FHIP1B, and one or more members of the Hook family of proteins HOOK1, HOOK2, and HOOK3. The FHF complex associates with the homotypic vesicular sorting complex (the HOPS complex). Belongs to the FHIP family.