My iPhone 6 plus won't record audio

please click this to identify the issue --> If the microphones on your iPhone, iPad, and iPod touch aren't ...

FoxNot1 Said:

"My iPhone 6 plus won't record audio in the camera app. but the microphone is fine when calling. my guess is that one out of the three microphones is broken?"

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Caches getting in the Way:

A few things may been to be reset. So, clear "Other", through use of the following...

Clear "Other" (Applies to iPhone):

Clear the storage named "Other". It basically contains unnecessary files such as caches that are used for system ease of use - all of which gather over time: How to Clear "Other" in your iPhone's Storage - Use Backup - User Tips. Caches would be being used for remembrance of application use. So, clearing other may be the way to go about this, as it would be performs through use of a computer.