poohkh:
I want to integrate nrf24l01 and esp8266 so that i can upload the received data to cloud.any suggestions?
My suggestion would be to simplify your project so that you have more chance of success. Why do you want to use two kinds of rf comunication (nrf24 and WiFi)? Why use two microcontrollers when one can do the task (Uno and esp)? These things are making your project more complicated than necessary.
Is a wifi signal available where your remote sensors are? Can you use a WiFi extender to get a signal to it? If so, just use esp. No Arduino, no nrf24. Simple.
You can upload Arduino sketches to esp just like an Uno.
My favourite type of esp module is the Wemos d1 mini. They cost $4.
Paul