I guess you can download it and fill and sign it and upload it . Also you are missing birth certificate. You and your spouse both have to fill this form and sign it .
Thank you for your response Miss Bee.
This message was in February. We have reapplied and filled the form (IMM5406) online in April. I (the applicant) signed electronically, before submitting along with our birth certificates.
So, your advice is that we have to download, fill, sign and upload the IMM5406 form?
Since I have already submitted the application, can I send it through webform?