Acts as a regulator of endocytic traffic by participating in membrane delivery. Required for the abcission step in cytokinesis, possibly by acting as an 'address tag' delivering recycling endosome membranes to the cleavage furrow during late cytokinesis (By similarity). Homodimer. Forms a complex with Rab11 (rab11a or rab11b) and arf6 (By similarity). Recruited to the cleavage furrow and the midbody during cytokinesis. The RBD-FIP domain mediates the interaction with Rab11 (rab11a or rab11b).