Check out the documentation 'Online Proofing & Approval - How it works' for the answer on (most of) your questions regarding Online Proofing & Approval.
Some topics as mentioned in the document:
- Explanation of the settings per approval role in the approval workflow.
- Auto request new revision or manually request a new revision when an approver has rejected the file.
- Automatically approve the file or manually approve the file when all approvers have approved the file.
- How are the rejection reasons defined?
- How to define who will receive a request for starting the approval when the user who uploaded the file has no rights to do so?
- Who can access the approval tool? And from where?
- What options does a user have in the approval tool?
- Which notifications are sent for approvals?