PNGs are pixelated after importing

Hi,

I have been working on an animation that includes a few high-quality PNGs. They look good when I am in Animate, but when I export them they are pixelated in the video. The first screen capture is one example in Animate and then the 2nd is after it is exported. I have several animated clips I am working on and they all have the same issue. Thanks in advance for your help!