Windows phone 8.1 File Open picker. An easy way to do it?

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C#

XAML

Windows-Phone-8.1

Hi!,

I can do it for wpf and windows 10 desktop apps but apparently for windows phone it's totally a different way.

Is there an easy way to pick a file with the file open picker on windows phone?

This code is for windows 10 store apps but I need a way to do it for windows phone.
It seems MS has over complicated the way it's done for windows phone.

private async void btnOpenFilePicker_Click(object sender, RoutedEventArgs e)
        {
            var picker = new Windows.Storage.Pickers.FileOpenPicker();            
            picker.ViewMode = Windows.Storage.Pickers.PickerViewMode.Thumbnail;
            picker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.PicturesLibrary;
            picker.FileTypeFilter.Add(".txt");


            Classes.ClassDynamicFlashCards.file = await picker.PickSingleFileAsync();
            if (Classes.ClassDynamicFlashCards.file != null)
            {                              
                this.Frame.Navigate(typeof(FlashCardTemplate1));                
            }
            else
            {
                MessageDialog dialog = new MessageDialog("Operation cancelled");
                await dialog.ShowAsync();          
            }
        }