iTunes File Sharing

iOS & iPadOS
Hi, I just purchased the iKaossilator app from Korg this evening. It's similar to GarageBand, in that you can play a synth on the touch screen, but it allows you to compose music loops. Anyway, one of the features this product has is to let you import samples via a feature of iTunes called File Sharing, or so I gather from what I saw on a YouTube video. I've also seen mention of this feature in other apps, but I'm wondering how you'd use it with iTunes for Windows? Thanks. Kelly