This tag returns the value of $_ctx→file_url. When defining this value while loading the template file, we can then include a multimedia player, inside the generated template file, that will read the URL

{{tpl:MediaURL}}

Example with an MP3 file:

{{tpl:include src="_mp3_player.html"}}

The _mp3_player.html file will use the

{{tpl:MediaURL}}

tag and will read the MP3 file for which the URL is defined with the value of $_ctx→file_url.