I cannot change any dimension value with my.sketchup on iPad

[TheOnlyAaron]

Unfortunately, my.SketchUp does not yet support iOS.
Per John Bacus:

@jbacus

I hear you- I love my iPad Pro as well, and I want to be able to use it with SketchUp too. We didn’t intend that my.SketchUp should be a solution to the problem of running SketchUp on a tablet, primarily because the UX is really different when you don’t have a keyboard or a mouse. That new Pencil is awesome.

Our most full-featured solution for working with SketchUp models on your iPad right now is the SketchUp Mobile Viewer. You can’t edit models with it, but it is a pretty capable model viewer.