As you are very likely familiar with the 2-slit experiment, I am of the view that 'information' [?] flows from both directions of what we perceive as 'arrow of time'. The act of choice constrains the possible pathways and that reduction is what we call 'state collapse'. So without measurement at the slits, all possible pathways are active and naturally we perceive them as an 'interference pattern'. As soon as we close the door on 'choice' flow from 'future' has no other possible path way other than the single open slit. This we note as the 'particle' modality of the experimental setup.

That answers the so-called 'paradox' of the experiment but still doesn't address why we perceive an arrow of time going forward. Now returning to the 'discreet' aspect, I posit the 'computation' of the 'virtual smooth construct of perceived reality' is what we are registering as a forward movement in an inherently timeless universe. It all seems to be inexplicably bound up with the phenomena of consciousness.