note that we cannot have hotspot and wifi on same time so we first gonna make the hotspot
In settings for hotspot
For example on ssid I put LG hotspot and a pass xxxx
Now we going and open wifi and open cc app it found our cc and moves as to the setup
Note because our hotspot it's close we need to put exactly the ssid and pass in able to be connect in my case I use LG hotspot and pass xxxx
Now press connect and in the time that it search to connect to cc open the hotspot that you create, it automatically close the wifi and the cc app will tell you that it needs to turn on your wifi
(it depends on your device some might show lf any device have connected to your hotspot mine it doesn't but it should be connected )
Now lf u go to the left panel and press screen cast it gonna tell you no cc have found
Open your data and your done it found the cc and starts..
In my device using LG g2 lf I close the data it stop the cast in a Galaxy s4 that I try it keeps Casting without any problem at all in any case using cast screen and data it not gonna use pretty much anything
I hope I helped and make many more happy!