Tube website not showing thumbnails

1. I created a new tube website by downloading a theme from other website.
2. I tried uploading an embedded video from openload and setting a featured image
3. However, I don’t see the image on the post, only the default icon which was uploaded in the theme file.
4. Is it because of an error or I’m doing it wrong?

I’m posting my functions.php script below:

[ Code redacted, that’s too much to paste here]

• This topic was modified 8 years, 1 month ago by Jan Dembowski.