I've added custom meta to feed.rss without an issue before, but my recent attempt isn't working quite right.
{{#metadata}}
<figure>
<figcaption>Listen:</figcaption>
<audio controls src="{{audio}}"></audio>
<a href="{{audio}}">Download audio</a>
</figure>
{{/metadata}}
Where {{audio}} = the MP3's URL. The audio player is showing in the feed even when posts do not have {{audio}} custom meta data. Any suggestions?
You'll want to do this instead:
{{#metadata.audio}}
<figure>
<figcaption>Listen:</figcaption>
<audio controls src="{{{metadata.audio}}}"></audio>
<a href="{{{metadata.audio}}}">Download audio</a>
</figure>
{{/metadata.audio}}
The {{metadata}} object is always present, the {{metadata.audio}} property is only present when you set custom Audio metadata in your post.