perch_content_custom with templates that include another template

Hey guys,

just learned about perch_content_custom(); which is cool but I can't wrap my head around the following thing:

I have this region on my index.html:

<?php perch_content('Photo Series'); ?>

Which I set up to allow multiple of this template (content/photo_series.html):

<div class="images-source" style="display: none;">
  <perch:repeater id="photos" label="Photos">
    <perch:template path="content/photo_list_item.html" />
  </perch:repeater>
</div>

Which in turn obviously allows more than one of this template (content/photo_list_item.html):

<a href="<perch:content id="photo" type="image" width="1200" height="1200" bucket="works" label="Photo please!" />">
  <img data-src="<perch:content id="photo" type="image" width="700" height="700" bucket="works" label="One of your magnificent artworks here please!" />">
</a>

All of that works just perfectly (awesome by the way!). But now I'm trying to grab one of those pictures (one picture from the ones contained in one of the many items in "photo_series.html") doing this:

<?php perch_content_custom('Photo Series', array(
      'page' => '/index.php',
      'template' => '_rand_hero_image.html',
      'sort-order' => 'RAND',
      'count' => 1
    ));?>

Through this custom template here:

<figure class="header-artwork" data-image-url="<perch:content id="photo" type="image" width="1200" height="1200" bucket="works" label="Photo please!" />"></figure>

That gives me an empty – which I'm sure is absolutely correct (because it works when I use any perch:content from "photo_series.html" instead of the one here which is in "photo_list_item.html".

Any ideas?

Thanks guys – you're awesome!