If you have a blank clear box. It sounds like you either.
- got a 404, as your zip file contains a folder of files instead of the files
- uses absolute links to css/js files for your extension
- tried to use Javascript or CSS from a CDN which is not allowed.
Refer to the chrome inspector/other web inspector for errors/warnings.
In most cases Video - Component Viewer Path should be set to the same as Video - Fullscreen Viewer Path
Each view, has it’s own HTML file setting path. You will need to set the path for each view type
This would suggest you have ticked to enable “Video - Component” and didn’t provide a path to a HTML file to load.