If you share these details, I can provide a more tailored installation guide.
: Access the Omnitrix via a Cleo Menu (a common script engine for GTA SA mobile). ben 10 mod gta sa android
Install the CLEO APK. Open it and grant storage permissions. It will patch your GTA SA installation automatically. You will know it works if you see a "CLEO" folder inside Android/data/com.rockstargames.gtasa/ . If you share these details, I can provide