Screen Recording That Includes VoiceOver Sound

I believe IOS 13 will support that request on your phone itself.

For my Screen Recordings, I plug a small speaker (I think mine is from JBL) into my iPhone 7. To do that, I need the lightning to 3.5mm headphone adaptor that came with the phone. Then I connect the adaptor and the speaker using an 3.5mm cable.
For the actual recording, I use the function which has been part of IOS since version 11. One does have to make sure the Microfone Recording switch is on of course.
Using this setup, I talk into my phone to comment, and whenever I want my audience to clearly hear what VoiceOver says, I hold the phone towards the speaker.
hth

I plug my iPhone 7 into my mac, and record it with quicktime player. Hope this helps. I also have audio highjack and reflector 3 if I want to record my iphone in another way, such as via airplay.

I use my ipad. I turn on the microphone, turn the volume up a little louder & that's it. I've done a few screen recordings for Weather Gods.
I always tell them to let me know if they couldn't hear it or whatever the case may be. just in case.

The best approach for recording VoiceOver output from an iPhone is to use a lightening to 1/8th inch adapter and plug it into the sound card of your computer. As others mentioned, you can also get the iPhone audio to come out of a speaker either with such an adapter or by using a bluetooth speaker.

Since I don't have a lightening to 1/8th inch adapter, however, I pair my iPhone to my Amazon Echo device via bluetooth and then connect my Echo device to my computer's audio input with a mnormal 1/8th inch cable. This is how I make clear demos of my iPhone's output.

Many ways to skin a cat!

--Pete

Nobody explained how to *do* an actual recording. Go to your control center and select screen recording.