Blank Screen no display of html files

i am embedding an html file which has a video when i am using path file: /// android_asset / .html the screen is blank if i specify the link of website or a page which has a video embed it works ?

do you test this in the companion app or after building in the apk file?
that link should work for the apk file
App Inventor meanwhile introduced the general path http://localhost/yourFilename.html, but I think, Kodular still did not add that feature?