Google Drive/Google Slides

So I'm sure this will be an easy answer for this subreddit. I'm making a Google Slides presentation for the first time in my 53 years. I muddled my way through and did it and now I need to add voiceover's to each slide. All the info I'm finding is saying open a folder on Google Drive and drop each audio into it. Okay fine. My kid showed me how to make the screencast audio. How do I get the screencast audio into a folder? Please use the most basic language possible for me and thanks in advance for any help.