Why doesn't the audio show up in my iOS 11 screen recording?

I have the beta version of iOS 11 and have been using the screen recording function. However, the audio from what I'm doing on my phone doesn't always show up on the final video. I'm thinking it is just because of the length. I recorded a video about a minute long to test, but the video I tried to record is around 20 minutes. Is this on purpose or is it a glitch? And is there a way I can fix it?

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