There are no demands/petition attached to the complaint and Injunction. Do a partners demands have to be filed initially or can that occur later?

The main problem is that the language used in your question is not the "terms of art" that makes answering them straight-forward.  For example, there is no such thing in family law as "demands," and "partner" is a term of unknown meaning, so it is unclear what, precisely, you are referring to or asking.  Even if a divorce complaint is defective in some regard, an answer (or a motion to dismiss) should be filed within the time allowable for an answer.  If this response is insufficient, I strongly advise you to scan whatever paperwork you are looking at to a family law specialist, who can then comment on the paperwork involved.