How does the dbt sql script "from csv.***" can work

[answercn]

Hi @zsvoboda . First tons of thanks for you good job.
I install a pure dbt, then code a sql file including "from csv.***" in models folder.
In dbt profile yaml file, set postgres db as target. I wanna load csv file to postgres directly by using cli "dbt run".
But it isnt work. How dose "from csv.***" can work.