Yes, to complete the upload process and to transmit the document requested, you need to click next and electronically sign and submit it. Thats when it gets sent to IRCC. Just by uploading the file in the placeholder it does not get sent to them. You should have done this earlier for the other ADRs as well. Didn't you do this when they first asked you for the additional documents? The steps I told you are only applicable if you had already submitted the ADR that was requested by IRCC but you are still seeing additional placeholders like a glitch when you login sometimes etc. If you had never done this before, when you tried to submit your ADR, then its possible you did not complete the transmit process.