@Kirankumar_Gollapall I did some quick research and found out that this seems to be an issue with Android, especially affecting Nougat at random. You can read more about this here, here, here and here.
We will take this up with Google directly. @Ramagopal_Reddy_Palu and @RohitRathi will help with that.
In the meanwhile, you need not be worried, since tcloud syncs your photos & videos in full resolution. Your messages, contacts and call logs are also securely backed up. I hope you've enabled this sync from tronx -> tcloud -> Settings.