Do not use YouTube links without a password. Do not use APK websites that ask for your credit card. The safest source for the "Extra Quality" Android version is dedicated modding forums such as GTAForums.com , libertycity.net , or the MixMods blog (Brazilian, but English friendly).
Navigate to your Android's internal storage: Android > data > com.rockstargames.gtasa . Do not use YouTube links without a password