This video shows how to make soft fluffy idlis using Idli rava/rice rava. There is no need to grind the rice. It is enough to soak theurad dal alone.
Ingredients
Urad dal 1 cup
Rice rava/Idli rava 2 1/2 cups
Salt
https://amzn.to/2CWigDY idli rava
https://amzn.to/2RYH7kV ultra wet grinder