How many rounds are there in the 20 15 South American Libertadores Cup qualifier?

There is only one round of the South American Libertadores Cup qualifier, and 12 teams play home and away rounds. After the promotion, the six teams will play group matches with 26 teams and ***32 teams that have directly advanced to the group match. The group competition is divided into 8 groups, and the double round robin system is adopted. The top two players in the group will advance to the knockout round 16 until the champion is finally decided ~