Fix downloadFile

salesbook.Maui/Platforms/iOS/Helpers/PreviewControllerDs.cs

@@ -0,0 +1,16 @@
+using QuickLook;
+
+namespace salesbook.Maui.Helpers;
+
+public class PreviewControllerDs(QLPreviewItem item) : QLPreviewControllerDataSource
+{
+    public override nint PreviewItemCount(QLPreviewController controller)
+    {
+        return 1;
+    }
+
+    public override IQLPreviewItem GetPreviewItem(QLPreviewController controller, nint index)
+    {
+        return item;
+    }
+}