Retrieve attachment from a Post - mailgun

hi there - hoping someone can help me with a simple issue I have having with retrieving data from an HTTP Post.   I am using mailgun to post an email message to a simple method in my application...  Everything is working correctly except I can't get attachments out of the POST.  I noticed that the encoding is set as multipart/form-data and the support guys at mailgun indicated I had to use $FILES to retrieve the data from the post.   I am a bit of a newbie, so now I am lost..

Here is what my current code looks like:

$subject = $this->request->data('subject');   //THIS WORKS

$attachement_test1 = $this->request->data($_FILES['attachment-1']);  //THIS DOESN'T WORK

$attachement_test2 = $this->request->data('attachment-1');//THIS DOESN'T WORK EITHER

$this->log("New Message");

$this->log($subject);

$this->log($attachement_test1);

$this->log($attachement_test2);

Snip from the mailgun docs:

attachment-x

string

attached file ('x' stands for number of the attachment). Attachments are handled as file uploads, encoded as multipart/form-data.

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