If your internet connection drops while downloading the game from the Play Store, the OBB may be corrupted.
Open your File Manager and navigate to: Internal Storage > Android > obb Main.8.com.rockstargames.gtasa.obb File Download Fix
Inside the obb folder, you must create a new folder named exactly: 2. Move the OBB File If your internet connection drops while downloading the
On newer versions of Android, the game may lack the "All Files Access" permission required to read the OBB folder. Step-by-Step Fix: How to Install the OBB File Properly Step-by-Step Fix: How to Install the OBB File
Always ensure you are using the OBB file that matches your APK version. If you are using GTA SA v2.00 or higher, the "Main.8" file will not work; you will need the corresponding "Main.200" or similar file.
If you are installing the game manually (via APK), the OBB file must be placed in a very specific folder, or the game won’t recognize it.