CA 8321 then 3U 8204 at Pudong
Beijing Daxing → Shanghai → Kunming
Timetable, Shanghai time
13:00CA 8321 from Beijing Daxing at the gate
09:553U 8204 to Kunming leaves the gate
20 h 55 apart on the timetable, overnight
3U 8204 leaves 20 h 55 after CA 8321 arrives on the timetable: more than half a day, so not a connection we count.