Like a Layout, a Layout Region can contain any object: text, pictures, media, or even other Layout Regions. To add objects to a Layout Region:
Select the appropriate tool and create an object within the Layout Region.
Drag objects into the Layout Region from elsewhere on the page.
To make the Layout Region expand as needed to contain the object, drag the object into the Layout Region.
When the Layout Region border changes to a thick blue outline, the object is contained in the Layout Region.
To drag an object over a Layout Region without embedding it, hold down Alt as you drag the object.