Show/Hide if field is empty

Hi,

I’m really stuck on how to show/hide an element on the app side if a dynamic value/field is empty.
For example, I want to show/hide a Paragraph (or the like) when the field is NULL - I highlight the paragraph and then use the Dynamic Attribute, and add Display >> Show or Hide and then using the light bolt icon, I select the Data format to create a condition.

But I can’t get this to work?
I’ve tried:

(mediaTitle != '')
(mediaTitle != NULL)

Can someone kindly assist please?

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Screen Shot 2021-08-25 at 5.52.24 pm948×1904 114 KB