Replacement BRP ‘original’ passport

I received my FLR(M) a year ago, shortly after getting married.

My new passport has been issued in my married name. I am now in the process of applying for a replacement BRP in my married name. I have been using my maiden name up until now.

Under the ‘documents’ section of the UKVI application form, it says this:

You must provide your documents after you submit your application, these can be originals or copies. Any passports provided must be originals.

You will be able to upload copies of your documents on our commercial partner's website, or you can take your documents to your biometrics appointment to be scanned and uploaded by our commercial partner for a fee. You'll be told how to book an appointment and upload your documents after you submit your application.

You do not need to send any physical documents to the Home Office or UK Visas & Immigration unless you are advised to do so.

Does this mean I have to send in/provide my physical passport? Or can I still upload the scan of it online and that will be fine? I’m confused by what the difference is between “originals” and “copies” if everything is just scanned in anyway.

When you go to the appointment for taking biometrics, they will ask for your original passports to double check that what you uploaded to the system corresponds with reality. After that they give them back to you.

as they say in the last sentence, only in very special cases they will ask you to actually send them in.