From the menu along the top: Choose Share -> Export podcast to disk. The following screen comes up, be sure to have all of these settings:

[[image:space/showimage/compress_using.png width="433" height="270"]]

If you have music as well, you will need to change the audio setting from spoken podcast to music.

This will now be an m4a file. Use the edit bar in the wiki and choose the Insert Images and files icon to upload your podcast.