Steps for Voice Over Presentation (video)

Apologies as I need some clarification - am I right to say if I want to do Voice Over presentation, I will need to create powerpoint slides, then record a narration, and thereafter convert the slide show (with narration) into a video file before it can be accepted by Udemy ?

Is it better to insert audio to the slides or to record within Powerpoint itself?

Appreciate some guidance as am a newbie. Many thanks!

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