@profpatw123 ...
Can you please clarify what you mean by "upload replies"? When I think of "upload", I usually think of uploading a file from my computer to the internet (to a Canvas course, to my Dropbox account, etc.) When I think of "replies", that's usually associated with some kind of discussion board on the internet (Canvas discussion topics, replying to your topic here, replies to other social media posts, etc.) If you could provide some more details on what you are trying to do...and maybe include a screenshot of where the issue is occurring, that would be helpful.
Looking forward to hearing back from you...