Hello @Channara .
We have done tests to successfully download up to 100,000 TEIs. From the picture you sent I see the two arrows in the notification up still there, this could means this are still downloading. Are you using the training App? If yes I would recommend following this guide (Android Troubleshooting (technical guide)) to see with Flipper where the issue might be. Otherwise, could you branch your phone to a computer and inspect the logs? Let us know.