Azure Media Services and Overlays w/XAML storyboards and images

Hi,
We are moving our Expression encoder service to the cloud. One feature we rely heavily on is the Overlay feature, utilizing a XAML file with storyboards.
In order to do so, I upload some .jpg assets, then add them to the Task's InputAsset.Add() method.  I also upload the XAML file, and refer to this file in the Presets configuration via %xx% notation. The XAML file looks like (some bits
removed for brevity):
<Canvas x:Name="LayoutRoot">
   <Image Source="slide1.jpg" x:Name="Slide0" Opacity="0" Width="768" Height="432" Canvas.Left="0" />
       <Canvas.Triggers> <EventTrigger RoutedEvent="Canvas.Loaded"> <BeginStoryboard>  <Storyboard>
             <DoubleAnimation Storyboard.TargetName="Slide0" Storyboard.TargetProperty="Opacity" BeginTime="00:00:00" From="0.0" To="1.0" Duration="00:00:00"
/>
.... more animations to fade out, load the next image, etc.
</Canvas>
Results: I know the XAML file is working properly, because I see the transitions occur during playback at the specified times. HOWEVER, none of the associated <Images> show up. The overlay fades in, sticks around for the specified
time, and then fades away...however, the image itself never shows up.
I have tried using the %xx% notation on the <Image Source=> tag, but that doesn't seem to help. I've also added other various animations to the XAML file which indeed show up, such as moving a box across the screen. So I am pretty confident
the plumbing is working as it should.
Anyone with some helpful information as to what I may be missing?

Following up offline with Jim

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