Reivsion in ScholarOne: Where to upload the response to reviewers as a attached file? For the revision, I found there are two possible attachment places for the response document.
I don't know which one is the appropriate place for attaching the document. Please help me!

One is in 'Step 1: View and Respond to Decision Letter'. At the end of the page, there is a sub-section named 'Attach a File:'.

The other is in 'Step 3: File Upload'. Similar to the first submission of the manuscript, I think the response document could be attached as supplementary file below the revised version of manuscript.

So where is the right place to attach the document responding to reviewers comments?
It should be uploaded as your response to the decision letter.