Make Video Grid Post Grid

Hello,

concerning following post/instructions:
https://pickplugins.com/blog/make-video-grid-post-grid-plugin/

I did everything you described, but i still have only three option:
- first images from content
- empty thumgnail
- featured image

I have already created 5 posts with "Custom youtube id" at "Post Grid - Post Options", but i won't get the options you described when creating a new post grid.

Do you have any idea?

Yours, George