We are mapping the Lead Source Description to the Lead record, but I don't see that I can place it on a Contact record after conversion.
It is not an available field on the Contact?
The link you added does not work.
In Studio it is not an available field. Are you saying to create a new field in the Contact and then map it from the Lead to the Contact?
I guess I don't understand why it is not there by default. Why wouldn't you want to know where a Contact originally came from?