Folder Migration Access
Folder Migration Access is for Google Super Admins to provide users the ability to move/migrate folders into Shared drives. This add-on gives users the Admin role permission in bulk.
Access is granted roughly at a rate of 2000 users per 30 minutes. Access grants cool down for 30 minutes before continuing when there are a number of users. The more users being granted access the longer it takes to display the initial list of users.
For all files in a folder to transfer to the shared drive the user must have at least edit access to the files.
Access can be provided by OrgUnit (including all children orgs), list of emails in a Sheet, or full domain.