When you manually create a new post with RetroTube theme, you can add a main thumbnail as featured image but you can also add several images for thumbnails rotation.
Where can I add several images for thumbs rotation?
In your post admin under the description section, there’s a “RetroTube – Video information” metabox. You will find here a Thumbnails section with a Add Thumbnails button:
Then in the media popup you can upload your images and select the ones you want to use for the thumbnails rotation:
Click on “Choose images” and you will see the images selected in the Thumbnails section:
It’s done! You have manually set thumbnails rotation for your post. Don’t forget to update your post to save the changes 😉