How to do Mobile Inputs (Touch/Pinch)

I am starting to create projects for mobile devices, but cannot seem to find much documentation on how to use touch inputs. For instance, I have a scene where I can click the mouse and drag to spin around an object, or scroll the mouse wheel to zoom in or out. How can I perform these same actions on mobile devices? I can’t seem to figure out how to use the pinch to zoom in and out or pan around an object. There seems to be very little info anywhere online, so any help would be appreciated.

Hello. Did you found answer for your question? Can help me?

I’m still working on it, its not that smooth… but here’s what i’ve got:

UE4 Pinch to Zoom.jpg