Developer tools - network. I am sending a multi-part form. I want to change the content type from application/octet-stream to image/jpeg. Make change, resend, response is "Missing parameter 'csrf'". But what I have noticed is that if I simply retype application/octet-stream (or even over "cte") then I get the error. Resending without any edits does not give this error. So simply editing the request and resending causes the error. Most likely I am doing something wrong but can anyone help?

Just to add using Firefox 132.0.1