Understanding this process is crucial. A mismatched region (e.g., using a European save on a US ISO) will result in the emulator failing to read the data. Therefore, the utility of the save data is entirely dependent on the user's technical diligence in matching the region of their game ISO with the region of the downloaded save.
You will need a file manager app with access to your device's internal storage. naruto ultimate ninja 5 save data aethersx2 free
If you have a save from the PC version of the emulator: Understanding this process is crucial