Hi Charles,
First, Welcome to the forum!!!
2nd, export as a gif animated file - the gif has the transparency option for the web, so does png - but png is static and can not be compiled like gif to be animated.
I don't have ct7, but i do believe it has an animated gif export option, if it doesn't have the transparency option, then export it green screen, call up the animated gif file in a photoediting program capable of doing gif, and manually erase the green from the frames, and set the appropriate transparency and loop settings.
this is an example of the concept -
Cheers!!
☯🐉
"To define Tao is to defile it" - Lao Tzu