Use this function to get the path used for external storage for this application.
const char* SDL_AndroidGetExternalStoragePath()
Returns the path used for external storage for this application on success or NULL on failure; call SDL_GetError() for more information.
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This path is unique to your application, but is public and can be written to by other applications.
Your external storage path is typically: /storage/sdcard0/Android/data/your.app.package/files.
This function is available since SDL 2.0.0.