Tracking Download Links

I have multiple pdfs embedded as download links on our pages.

For the Actions–>Downloads, the count is only recognizing a few of the downloads. I did verify there are <a href = "…pdf> listings in the page source for the ones that are not getting counted.

Is there something specific that the tracking is looking for to identify only some clicks as ‘pdf’ downloads?

I’ve noticed one difference between the Drupal pages when watching the dates posted to piwik_log_link_visit_action.

Works:

PDF in Downloads or Documents section - Content type
Gets tracked in piwik_log_link_visit_action

Doesn’t Work:

PDF in Training section - Content type
Does not get tracked in piwik_log_link_visit_action

I reviewed the fields that are used for the pdf URLs, both have the same settings.

I also made sure that the page that has the PDF link on it is in fact getting tracked under the Pages section.