I just did this recently, I used a Chroma Key for transparency, just layer it in Video Pad and use the Chroma Key Video Effect. On another project though, I needed to export it with a transparent background (a stinger transition) so I had to export it as an Image Sequence as PNG with Transparency, and a third party tool to turn that into file type and encoder that could handle actual transparency (WebM or mov) in video. Hope this helps.
Exporting with transparent background
in ExpressAnimate
Posted
I just did this recently, I used a Chroma Key for transparency, just layer it in Video Pad and use the Chroma Key Video Effect. On another project though, I needed to export it with a transparent background (a stinger transition) so I had to export it as an Image Sequence as PNG with Transparency, and a third party tool to turn that into file type and encoder that could handle actual transparency (WebM or mov) in video. Hope this helps.