If you ticked I want to approve the content before it is published, the creator sends you a draft first.
Step by step
Open the draft
The collaboration shows Draft to review and the draft arrives in Messages. Read the complete post before deciding.
Approve
The creator is told it's ready to publish.
Or request changes
Write what should change, then send. The creator sends a new version in the same thread; earlier versions stay visible.
Without your answer, the creator is blocked and can't publish.
FAQ
Does approving pay the creator?
No. Payment is released when the creator submits the link to the published post.
Can I turn on approval after booking?
Approval is chosen when you book or accept the collaboration.