Bad quality

Why is it making my videos I post on my story look blurry. I have an iPhone 6s Plus and it shouldnt be doing this it didnt used to do this. NOBODY WANTS BAD QUALITY. Yes I reinstalled and watched my story on someone elses Snapchat and its still blurry. FIX IT PLEASE

_nobodyhasthisnickname about Snapchat, v10.4.1.0