private async void OnCameraClicked(object s, EventArgs e)
{
    if (!await RequestCameraAsync()) return;

    var photo = await MediaPicker.Default.CapturePhotoAsync();
    if (photo is null) return;

    // Copy to app storage for persistence
    var dest = Path.Combine(FileSystem.AppDataDirectory, photo.FileName);
    using var src  = await photo.OpenReadAsync();
    using var dest_stream = File.OpenWrite(dest);
    await src.CopyToAsync(dest_stream);

    CapturedImage.Source = dest;
}

var photo = await MediaPicker.Default.PickPhotoAsync(
    new MediaPickerOptions { Title = "Pick a profile photo" });

if (photo is not null)
{
    var stream = await photo.OpenReadAsync();
    ProfileImage.Source = ImageSource.FromStream(() => stream);
}