G'day George -
So you don't have the logo animation as a video file? If you do, forget what is written below.
PD can't see them as a video unless it's in a video format.
The series of .png files represent each frame in the animation. They'll probably be named sequentially, so that (00001.png would be the first frame, 00002.png the second & so on up till (say) 03421.png, which is the last frame.
You can import all your .png files & drop them in the timeline. Select all > click Slideshow > Time Lapse. The default duration for each image is 00:00:00:01 (1 frame), but you can customise it. You probably won't need to.
Produce the slideshow as a video & you're almost good to go. When you go to use it in a video, you'll probably need to apply chroma key/use a mask because the transparency in the .png files will be lost.
Cheers - Tony
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