On September 27, 2019, Apple finishes the review of version 13.1.0 of PDF Notes S and it became Ready for Sale.
As iOS updates to 13.1, on September 26, 2019, I uploaded version 13.1.0 of PDF Notes S to App Store.
On September 23, 2019, I uploaded version 13.0.0 of PDF Notes S to App Store
App Store https://itunes.apple.com/app/id961336139
This version added a PDF creation & assembly (rotate/insert/remove page), and supports iOS 13 dark mode.
BTW, apps not developed by Apple can't recognize 3 or 4 fingers gestures in iOS 13.0. Since iOS 13.1, they are recognized correctly.