Share Documents from a Private Google Account to the ETH Account
Manual
Open Google Drive and sign in with your ETH account
On the left hand side click on "Shared drives"
At the top left click on "New"
Enter the name for the shared drive and click "Create"
In the left column, click "Shared drives" and double-click on the shared drive that you just created
At the top click "Manage members"
Enter the email address of the account you wanna share the drive with
Choose which role the new member should have, the following are available:
Manager: can manage members and can upload, edit, move or delete all files
Content manager: can upload, edit, move or delete all files
Contributor: can edit or upload all files
Commenter: can make comments on all files
Viewer: can read all files
Click "Send"
Now the account that you shared the drive with can access the drive and do the actions you allowed it to do with the role. Additionally, you can also upload, edit, move or delete all files in this drive with your ETH account.