XLabs - Take Photo, save it, close app, retrieve it again

If this question has already been answered, please let me know. I am about 3 weeks into using Xamarin and so far I like it. I am working on an app where I am allowing the user to take a picture. I am able to do this successfully and retrieve the image using Xlabs. I need to be able to go back and retrieve that same image - potentially after closing the application. I really just need to maintain some sort of link to that image. If the user deletes it later (e.g. if it is on the phone gallery I am okay with that). Without getting into the details of the app, these are non-critical photos that the user may or may not decide to delete. I don't want to store them within my app or send them to a server at this point.

I am following the example below that is referred to numerous times on these forums. This works great for displaying the initial photo after taking it. I get a path that looks like this:

/var/mobile/Containers/Data/Application/B7E0B09A-E39C-4A30-BAE0-E277AC3214CA/Documents/IMG_20150729_080622.jpg

I did make a feeble attempt at re-loading the image but it didn't work (see below).

` private async Task TakePicture()
{
Setup ();

        ImageSource = null;

        try {
            _statusEntry.Text = "Launching Camera...";
            return await _mediaPicker.TakePhotoAsync (new CameraMediaStorageOptions {
                DefaultCamera = CameraDevice.Rear,
                MaxPixelDimension = 400,
                SaveMediaOnCapture = true
            }).ContinueWith (t => {
                if (t.IsFaulted) {
                    _statusEntry.Text = t.Exception.InnerException.ToString ();
                } else if (t.IsCanceled) {
                    _statusEntry.Text = "Canceled";
                } else {
                    _statusEntry.Text = "Got Result";
                    var mediaFile = t.Result;

                    ImageSource = ImageSource.FromStream (() => mediaFile.Source);
                    _img.Source = ImageSource;

                    _statusEntry.Text = mediaFile.Path;

                    return mediaFile;
                }

                return null;
            }, _scheduler);
        } catch (Exception ex) {
            _statusEntry.Text = ex.Message;
            return null;
        }
    }`

My attempt at retrieving the file:

` public class ShowPicture : ContentPage
{
private Image _img;
public ImageSource ImageSource;

    public ShowPicture ()
    {
        _img = new Image(){HeightRequest = 300, WidthRequest = 300, BackgroundColor = Color.FromHex("#D6D6D2"),Aspect = Aspect.AspectFit };

        ImageSource = ImageSource.FromFile ("/var/mobile/Containers/Data/Application/B7E0B09A-E39C-4A30-BAE0-E277AC3214CA/Documents/IMG_20150729_080622.jpg");

        _img.Source = ImageSource;

        Content = new StackLayout { 
            Children = {
                _img
            }
        };
    }
}`