I'm working on my first pngtuber and this program has made it a very comfortable learning experience :)) I seem to be having the same thin grey outline issue but honestly I find it kinda charming, in any case super cool stuff tyvm
That's probably because the transparent pixels on the outer edge of your image have a white color value - you'll have to color them with some program that supports saving the color of transparent pixels. Depending on your program it might be an option that's off by default and you have to turn on.
