Ive been using http this whole time on all my cameras and enable https for amcrest.
when i enabled https on the amcrest camera under network>https it stopped working not matter what options i chose on blueiris.
ptz controls work fine on the camera web interface using https.
Unless you know how to create a signed Certificate ( i do not) you probably arent going to get https thru Blue Iris just by changing a couple of mouse clicks