On November 16, 2020, Apple finished the review of version 14.2.1 of PDF Notes S & PDF Notes C and they became Ready for Sale.
On November 16, 2020, I uploaded version 14.2.1 of PDF Notes S & PDF Notes C to App Store
PDF Notes S https://itunes.apple.com/app/id961336139
PDF Notes C https://itunes.apple.com/app/id1459073729
This version supports both iOS/iPadOS 13 and 14.