You can record your screen with audio (and a voiceover) on your iPhone to talk over your video. This functionality is built right into the iPhone. You don’t need to use a Mac or PC, or pay for an app ...
The simplest way to record audio on Chromebook devices is to use the official Recorder app. It's pre-installed on most modern Chromebooks, so you simply have to find it in your apps and launch it.
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