Import time and space dependent file

Hi,

I have simulated a 3D laminar flow model and export the cut plane velocity profile as section wise csv file. This velocity profile is space and time dependent. In a separate model, I want to simulate the transport of diluted species in the 2D cut plane geometry with a much finer mesh. I imported the csv file, but COMSOL cannot recognize the time steps; the interpolation function is not time dependent. Could someone kindly help me please? Thank you