Media files are not appearing in RSS feed

I run a website/podcast for a radio show that I produce. I upload my episodes via cyberduck ftp. For each episode I make a new post and link music media to it via add audio from URL. I use Powerpress plugin by Blubrry to power the podcast. For all of my episodes (22 previuos episodes) it has worked fine. Recently I registered with itunes and now they all appear on itunes which is great.

But now I am having a problem when I publih new episodes since that time. I link the mp3 file in normal way, but it is not appearing in the rss feed. This results in the absence of powerpress player in the post, and the podcast is not being published and does not appear in itunes. This is a problem for me.

Why is the media file no longer appearing in the rss feed?