The more comfortable is using a remote system like Real VNC π
The best for use a mouse on your Android tablett with an USB / OTG / connector!
(Right Click and Wheel are well emulated)
Of course your computer must be opened with SketchUp! π€
On a SmartPhone it's many less comfortable...
The "free" version on a Browser must be working also on an Android Tablett!
So no need mouse π
Else you have the free "SKetchUp Viewver" for Phone