I had this: UATHelper: Packaging (Android (ASTC)): ERROR: Android toolchain NDK r25b not supported; please use NDK r21 to NDK r23 (NDK r21b recommended)
Solution: run UnrealEngine\Engine\Extras\Android\SetupAndroid.bat
I had this: UATHelper: Packaging (Android (ASTC)): ERROR: Android toolchain NDK r25b not supported; please use NDK r21 to NDK r23 (NDK r21b recommended)
Solution: run UnrealEngine\Engine\Extras\Android\SetupAndroid.bat