Sorry I am so late to this. I can give a little insight. Ghana started Document reviews September 2024 and Nigeria started January 2025.
The embassy schedules the document review and it's scheduled anywhere from 2 to 4 weeks before your interview.
You have to come to the embassy and present your originals and financials and they look them over tell u to make sure to upload. Maybe update and make changes, and then it's sealed in an envelope that you have to bring to your interview to hand over.