Have you tried using a web browser instead of the app? I access ChinesePod on my iPhone with both the app and Safari, and I actually prefer Safari. The app has some limitations that the website doesn’t, plus I’ve heard of a lot of people having stability problems with the app (though I think that’s mostly the Android app, which I’ve never tried).
The only thing I’ve found that the app can do that the website can’t is put an individual Expansion Sentence on repeat. On the website, you have to push the button each time you want it to play. Other than that, the website has fuller features.