Uploading mandatory documents to Sopra Steria site

HI all,

Apologies if this is in the wrong section.
I am currently applying for naturalisation based on ancestry - my father is a UK citizen by birth. I have completed the online application form. According to that form, the documents I have to submit are my passport, my birth certificate on which my father is named, and my father's birth certificate.
I have all of these documents.

However, when I created my Sopra Steria account and booked my (paid - £60) appointment, there was no option on the site to upload any mandatory documentation. The option to upload optional documentation is there, so it isn't an issue with all uploads.

Does anyone know why this might be the case? Do I just keep logging in every few days and trying? What will happen if I'm not able to upload them before my appointment?

Many thanks in advance for your help.

Are you applying on form UKF?

My understanding was that HO expects to see original documents so they can be verified and authenticated.

Thank you for your reply!

Yes, I'm applying on form UKF. I have originals of all the required documents and I will take all of them to my appointment - I also have additional supporting documentation that I'm going to take as well. I just thought that part of the point of the online application system was that your documents were available to the caseworkers from the get-go. I just really do not want to encounter any hitches in this process, and I've read so many horror stories about faulty equipment and poorly-organised appointments on the part of Sopra Steria. I would like to do as much as I possibly can to make the process as smooth as I can.