My wife had her interview in early May. The consular officer said she was approved, but that they would have to perform administrative processing. They kept her passport. She sent the requested documentation to the specified email three days later, but it's over two months later now, and we've heard nothing back.
I read on some other threads here that you may also have to upload the documentation to NVC / CEAC? Here, https://ceac.state.gov/IV/Login.aspx, after logging in. Is that true?