Save picture from PDF: UnsupportedOperationException

Targets macOS
3

I try the 2 solutions with the same error.

Var pic As  Picture
'pic = p.BestRepresentation(100, 100, 32.0)
pic = p.ImageAt(0)

If Picture.IsExportFormatSupported(Picture.Formats.JPEG) Then
  Var tmp As FolderItem = SpecialFolder.Temporary.Child("FirstPage.jpg")
  Try
    pic.Save(tmp, Picture.Formats.JPEG)
    MessageBox("PDF first page saved as JPEG in: " + tmp.NativePath)
  Catch error As UnsupportedOperationException
    MessageBox("Save failed: " + error.Message)
  End Try
Else
  MessageBox("JPEG export is not supported on this platform.")
End If

I made this test, and imageViewer show a valid image as expected.

Var p As Picture
p = Picture.Open(file)
ImageViewer1.Image = p.BestRepresentation(100, 100, 32.0)

I also made this test, and got ant OutOfBoundsException p.image.Count return 0 in the console…

System.DebugLog(p.ImageCount.ToString)
ImageViewer1.Image = p.ImageAt(0)