Filling Text with a Texture?

I want to take a piece of video (specifically the metal texture from the generator tab) and fill my text face with it. What I've tried:

Selecting "Face" in the 'text' section of the inspector for the text I want to fill

Then I selected "Texture" from the "Fill With " drop down menu

Then I clicked inside the "Source Media" icon,

Next the monitor split and when I selected the section of video I wanted to use (in this case the metal texture I dragged from the generators) I clicked "apply clip"

and then nothing happnes, and the "Source Media" thumbnail remains blank..

I also tried this with other random video clips just in case it might be the generator, all to no avail...

...am I doing something wrong or is this another bug?