Background video

Hello - problems with background video". I have followed your online documentation, but no “Background video” in Properties.Found it in Components, and placed vid inside container sourcing it correctly. Fresh doc. Container width and height set to 100vh and 100vh in special created test movie.css. Fail in preview and online. I have the App Connect Local framework activated. It looks very simple according to your instructions but not for me. Is my video too large? 1.5 mins… I am NOT a coder Thankyou. I am a basic user only, Have checked other posts but not helping…