You remain in I-485 Pending status. Your status does not automatically convert to a Lawful Permanent Resident (LPR) just because the primary applicant was approved; each individual application must be adjudicated. As long as you have a valid Employment Authorization Document (EAD), you can continue to work legally in the United States. You are no longer in your previous non-immigrant status (like H-4) once you begin relying on the I-485 pending status or the EAD.

 Under the American Competitiveness in the Twenty-First Century Act (AC21), you can "port" your green card process to a new employer if your I-485 has been pending for 180 days or more and you have an approved I-140. If you are laid off before the 180-day mark, you are in a more precarious position. However, if your employer keeps you on the payroll via severance, your official termination date (the date you no longer have a "bona fide" job offer) is what typically triggers the legal concern.

Prepare a cover letter stating that you previously sent an email and are now uploading the corrected form with the right box checked. You should also verify if you are still within the timeframe to refile the case if necessary.