Re: isn't there anyway to modify/delete sent feedback in Windows Insider program?
I don't think there is, you should be able to add to it by adding a "meet to comment" under your feedback?
Not saying this is what you should do, personally I type up all my feedback in notepad / word and copy + paste in the feedback app. Due to the intermittent sign out bug have had to adopt a different approach to give feedback lol.