You can always go back and add documents for your spouse through your account!
Once you're logged in, just click your spouse's name (right under "Married to") in the Basics section on your Summary page.
Click "Save & Continue" until you get to the question below. Then, click "Yes" instead of "No" to create documents for both of you.
You'll need to go back and review each question and answer from the perspective of your spouse when applicable if creating documents on their behalf. Remember to click "Save & Continue" after to save your answer!