I regularly download dSYM from the Activity tab in app store connect.
In that tab there are list of builds from their detail we can download the dSYMs.
But from today after After App Store Connect update, I have seen that there is no activity.
Apple Thread related to this topic.
So, From where I can download the dSYM?
I found the way to download the dSYM
Update (17th Dec 2020):
Activity tab name changed to Mac Build Activity
Update (04th Dec 2022):
Find it under TestFlight Tab