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. Also required for the structural integrity of the endosomal recycling compartment during interphase. May act as an adapter protein linking the dynein motor complex to various cargos. Homodimer. Forms a complex with Rab11 (rab11a or rab11b) and arf6. In early mitosis remains diffuse and distributed through the cell. The onset of anaphase sequesters these vesicles to the centrosomes at the opposite poles of the cell. During telophase these vesicles move from the centrosomes, to the furrow, and then to the midbody to aid in abscission. The RBD-FIP domain mediates the interaction with Rab11 (rab11a or rab11b).