Remember that your 20×20 must be automated. I will click “Play from Start”and your project should automatically start with your 20 slides scrolling through automatically with your 20 second narration accompanying each slide.
Here is a link for more info:
https://support.microsoft.com/en-us/office/record-a-slide-show-with-narration-and-slide-timings-0b9502c6-5f6c-40ae-b1e7-e47d8741161c
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