Tracking .pdf download on Piwik site (no replies)

Hello Community,

I know this subject has been discussed several times but I cannot find a post or some documentation to confirm if what I did is correct and where the problem might be.

I have created a php echo

echo '<a href="index.php?task=download&file='.$enfile.'" class="piwik_download" >English</a>'

The URL appears correctly and file downloads correctly, when I go see my PIWIK statistics under actions download, I do not see any trace of the download and i see "There is no data for this report."

Where am I doing the mistake?

Thanks in advance for the assistance!