i followed a tutorial; first, go to the old editor and draw 2 different color lines, and have them touching. then, copy that frame at least 3 times. hit the settings button, and click the page with the red arrow pointing down, and it should download. from there, go to the beta editor, and upload it. then, zoom in a bunch and it should get blurry and form a gradient.

e sorry i copy and pasted that from one of my past anims- im to lazy to type it up again lol