Probably they will send your application back. Even if you send it now, there is no way they can attach it to your application as you don't have any file number. They gonna take your complete package and check for completeness, if something is missing they will return it. Same happened with me. I sent my package in June which was returned in July. My passport copies with entry and exit stamps were required at two different places (Sponsor's documents and Proof of relationship), I included it once(sponsor's documents) in my application but while looking in proof of relationship they didn't find it and didn't bother to look for it and returned my whole application back.