There is no design material available for native Android/iOS app. There are many engineers who are applying for a mobile engineering role will be asked to design app for native Android or iOS. It will be a great help if you guys please add a few. Frontend engineers face different challenges than backend engineers, so a few design material focussed on the native app will be really helpful. Looking forward to hearing back from you.
Yes, here people only target web developers could not find more contents for mobile app developers, Please consider this request and do the needful. If possible start with any cross-platform frameworks Flutter / React Native which is the latest trend.