using QuickTime video and VoiceOver

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I'm trying to record a screenshot video using Quicktime. The iPhone that is hooked to the computer that I'm recording with has VoiceOver turned on, but whenever I start a new recording, VoiceOver's sound turns off. I can still see the user use the iPhone but the only sound that is recorded is our own voices -- we cannot hear VoiceOver. Why does this happen? Is it something on my computer's settings, or in the iPhone settings that need to be changed? Or is this a Quicktime problem? Thanks in advance for your insights!