To activate the creative approvals process for a new creative, what step must be taken?
Set the creative to active
Assign the creative to an active line item
Resubmit the creative for approval
Upload the creative to Display & Video 360
Creatives cannot serve until they’re assigned to an active line item and have gone through an initial review. Creatives added to Display & Video 360 go through an approval process to make sure they’re safe and appropriate for users. Whenever you add a new creative or make changes to an existing creative, your creative is automatically submitted for review again.
Read more here: https://support.google.com/displayvideo/answer/6063030