Transparent Background Alpha Channel Help

Hi I recently downloaded the Lower Third Lines( 7 Pack). I have been trying unsuccessfully to export the video with a transparent background. I am using the most up to date version of aftereffects and importing the rendered file in to premiere pro. It always has a black background.

I export using best settings/quicktime rgb+Alpha
no matter what codec I choose the result is the same.
Can you help? Am I missing something obvious?

Cheers

Try exporting with straight alpha instead of premulitplied. (Use the AE native rendererer, under colorspace you can change alpha type.)