A Content Block is a custom group of content, in a specific order, that you can drop right into your playlist.
Open the Manager Platform.
Go to the Content Block section in the left menu.
Select or drag and drop the content you want to appear.
Order the content.
Name your block to help you identify it later.
Click Save and Close.
This indicates that the content is currently unavailable and will not be displayed on your screens.
Here are the two possible reasons and how to fix them:
The content is disabled: If the preview is still visible, the content is simply turned off. You must navigate to the content settings and enable it.
The content was deleted: If the preview shows a default placeholder image, the original content has likely been deleted. You will need to remove this option from your configuration.