I took about 40 pages including copies of everything uploaded of my wife’s (passport, taxes etc) plus originals of all my docs (birth certificate, police, passport, etc). Plus copies of new pics of us and travel docs. I also took print out of the invitation to interview and approval. Plus passport pics.
In the end I was asked for my originals of all above, and the confirmation emails for entry to building, but they didn’t even want to see anything from my wife. However as has been said, I’d rather have my file with it all than not.