Before I ask, I want to say I'm new to being a developer of anything other than my personal websites. I'm new to Android development and programming of any kind.
With that said, I followed all the instructions to make an apk to post to the Play Store. It worked fine. Then I made another to experiment with a paid app. I made the changes stated above and on the Zooper website. I bought and downloaded the app with a different account to my phone, but the skin does not work in Zooper. (If I move the file directly from my computer to my phone and install it, it works.) Any idea what I may have done wrong?
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Edit: Here is the code I used:
That was the only thing I did differently for the paid app. Was there anything else I was supposed to do?