ADMT Group Migration - Confused by Copy Group Members

So I'm testing with Group Account Migration in the ADMT 3.2.

When you get to the screen that has "Copy group members" on it, what exactly does that mean?
Does it mean, migrate the group to the destination domain/OU, as well as all of its members to the same destination?

In the Help/Description, it says "If you do not select this option, ADMT creates the group in the target domain, but the group does not contain members".
I'm confused as to what that means. Does it mean the Group will no longer contain members so after the migration, you have to re-add all its members?

what's strange is I migrated a Security Group between two domains. It was a test group, and it had 3 test account members.
I didn't check this box, and after the migration, the Security Group was indeed in the new domain, but it still contained the same members that exist in the parent domain.
According to my understanding of the description, since the checkbox isn't checked, the test Security Group I migrated should have had no members in it after the migration.
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Your understanding is good. According tot the documentation if is u checked it should only create the group , but not copy the members

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