  Transport calculations are the tool to study medium modifications of
heavy-flavour particle distributions in high-energy nuclear collisions. We give
a brief overview on their state-of-the art as well as on the questions
remaining open, from the evaluation of the transport coefficients to the
effects of in-medium hadronization, from the rescattering in the hadronic phase
to the possible presence of hot-medium effects also in small systems, like
proton-nucleus collisions.
