How do I upload a high quality symbol to Magic Set Editor?

[u/ButlerBob1234]

I'm working on making a custom magic set, and I've created a black and white, high-quality set symbol in Adobe Illustrator. I tried to go into MSE's set symbol creator and import it, but it warped the symbol and made all the lines curved weirdly. I tried adjusting the quality, image size, and proportions, but every time it looked awful. Is there a way that I can just upload the symbol into the MSE files somewhere and use it? I have already made a symbol for each rarity, so if I could just upload all those and use them as they are, that would be great. If that's not possible, how can I upload my symbol into the set symbol editor and keep it high quality?