We are ready to submit our revised application for Final Review, and want to know how/where we should submit/upload the response letter that we've prepared. We understand that this is not a required document but a consultant strongly recommended that we provide one as a way of summarizing the clarifications we've made. Of course, we've also addressed all review comments within the applicable credit forms.
Therese - I think this is good practice and is helpful to the review team - especially if you have decided to withdraw any credits.
I typically put it into PIf4 under Upload PIf4-SC (special circumstances). I outline what the document is in the Special Circumstances text box.