Rather than selecting from a list, I'm trying to navigate between drawings like a book using buttons to cycle through, but the canvas doesn't update.

I'm following the great tutorial by DevTechie at https://www.youtube.com/watch?v=amZH2i6l004&list=PLbrKvTeCrFAfoACvHOPWFmDIaKUqBZgEr&index=5

The github is here https://github.com/devtechie/DrawingDocuments

Here's my ContentView. I thought changing the id parameter would change the drawing displayed on the canvas. But it seems like DrawingWrapper isn't updating.

DrawingWrapper(UIViewControllerRepresentable) uses a DrawingManager to pull from CoreData and DrawingViewController to define a PKCanvas.

struct ContentView: View {
  @StateObject var manager = DrawingManager()
  @State var addNewShown = false
  @State var pageNumber: Int = 0
  @State var newVar = UUID()

  var body: some View {
    VStack{
      Text(manager.docs[pageNumber].name!)
      HStack{
        Button(action:{
          pageNumber -= 1
          newVar = manager.docs[pageNumber].id!
        }){
          Image(systemName: "chevron.left")
        }
        Spacer()
        Button(action:{
          pageNumber += 1
          newVar = manager.docs[pageNumber].id!
        }){
          Image(systemName: "chevron.right")
        }
      }

      DrawingWrapper(manager: manager, id: $newVar)

    }
  }
 }