ScrollBar and scrollrect seem not working on mobile

Hello guys! I have some UI elements which use scrollbar/scrollrect, on PC everything works as expected without any problem, but now I am testing on an android device and the results I have are: - I can select the scrollBar but I can't drag it where I need, it is just blocked on its position - I can move it only by tapping on a point (i.e. if my scrollbar is on the top, to move it to the bottom I can only tap directly on the bottom of the available space, which is not good on a small screen) - scrolling directly by the scroll rect (Maybe the best way on mobile) doesn't affect UI, just nothing happens.

I'm also trying to use eventsystems interfaces so I can create a script to manage the scrolling ( like IPointerEnterHandler, IPointerExitHandler ...) but they seem not to work, sometimes I just get an output from IPointerExitHandler which is totally no sense if the unity algorithm doesn't recognize IPointerEnter...

do you have some tips about this?

thank you in advance