Android 10 also - for the first time on Android - bought the scoped storage system that essentially prohibits apps from accessing files unrelated to them without explicit user consent.
Starting in Android 10, CTS runs in Instant Apps mode, which means installing the test APK as an Instant App and running the tests. To get started, we recommend reviewing the system behavior changes, privacy changes, and new features and APIs, then migrating your apps in these two phases: Download top 10 apk 1 for Android.