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In Swift Playgrounds I wrote a simple playgrounds where I want to load a .reality file. How can I do that? From iCloud it doesn't load it correctly.

If I create an object: for example a sphere of a certain material can I know its weight? Can I know the specific weight of a material among those I can choose in Reality Composer? Thank you to those who can help me.

I wrote this code in swift Playgrounds import SwiftUI import PlaygroundSupport struct ContentView: View {     var body: some View {         Home()     } } struct ContentView_Previews: PreviewProvider {     static var previews: some View {         ContentView()         }     }      struct Home : View {     var body: some View {         VStack {             LazyVGrid(columns: Array(repeating: GridItem(.flexible(), spacing: 15), count: 3), spacing: 15) {                 ForEach(0..<9,id:\.self){index in                         Color.white                     }                 }             }         }     } PlaygroundPage.current.setLiveView(ContentView()) and at lines witch contains LazyVGrid there is an error? Is it possible having LazyVGrid in Playgrounds?