With Import from Google Drive, you can connect to your drives as an admin to import the files of all your users in your Google Workspace without manually connecting to each account.
Index
Prerequisites
You meet all the prerequisites to perform an Import from Google Drive migration
You are a Super Admin in your Google Apps domain.
Setup
Administrator mode might take an initial setup for it to work properly.
Obtain Super Admin permission
Ensure you have the Super Admin permission in your Google Apps admin console. If you don't, you may have to ask another Super Admin for that permission.
Here is an article from Google documenting the process of adding admin roles to a user.
Delegate domain-wide authority
Delegate domain-wide authority to the ShareGate Migrate service account using the following instructions provided by Google:
From your Google Workspace domain's Admin console, go to Main menu -> Security -> API controls.
In the Domain wide delegation pane, select Manage Domain Wide Delegation.
Click Add new.
In the Client ID field, enter the following:
863730239928-qlbiuhv19ak18hi56mk2mp61ca9s5co3.apps.googleusercontent.com
In the OAuth Scopes field, enter the following:
https://www.googleapis.com/auth/drive
Click Authorize.
You may remove ShareGate Migrate access to your data from the Manage Domain Wide Delegation screen at any time. Click the client name and select Remove.
Google permissions needed
View users on your domain (read-only): ShareGate Migrate needs to list all of your domain's users to list them in the explorer and so you can create user mappings.
View groups on your domain (read-only): ShareGate Migrate needs to list your groups so you can create group mappings.
View domains related to your customers (read-only): ShareGate Migrate needs to know what domains are associated with your Google Apps account to check if you are allowed to create credentials for users that have a different domain in their email address.
How-to
Click Copy in the menu.
Under Import external content, click Import from Google Drive.
Type in your Google email.
Check Connect as admin.
Click Connect.
Follow the instructions in-app to complete your migration or see Walkthrough - Import from Google Drive
Note: When you log in as an administrator, the explorer differs from the normal Google Drive explorer. The root folder will be the domain from which you logged in. This may or may not be your primary domain associated with your Google Apps account.