video previewing & music control issues with High Sierra

hi.

i just upgraded to 10.13.1 and now i can´t use the gesture (scrolling with two fingers) to move forward or backward previewing the videos from the finder. (i loved this function)

i also can not play or pause or change songs directly from my keyboard (f7, f8 & f9 buttons).

This were two basic functions that we need back as soon as possible please... or if they are hidden somewhere... could you explain where?

Thank you.