When videoing on either side (front or back) of my iPhone 8+ the internal mic is used even though my Bluetooth headset is paired, and connected. The headset works for all other tasks on my iPhone, ie. phone calls, dictating texts, emails, etc.
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Larry McNamee
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I don’t think you can. Get a mic that attaches to the Lightning port. It may be possible to get a video recording app that lets you select the bluetooth mic as input, but I don’t know of one offhand.