We had a hard time implementing the working BottomSheet with a scroll view inside and swipe to hide gestures. Basically there was an issue with gesture handler inside the Modal. We managed to make it work for iOS but not for Android. There is PR with the first version - WordPress/gutenberg#18574 - please check comments, there are a lot of details about why we need that.

We need that PR -software-mansion/react-native-gesture-handler#937 to be released to implement the ideal version for iOS and Android.