Help with tweening particle size

hello, im trying to tween a particle size and i cant figure it out, any help? error shows in the picture.
Size (Cosnez Editing) - Roblox Studio 10_5_2022 4_09_01 PM

You can’t use tween a particle size using a script.

You can however tween it using the 3 dots when selecting the size property.

image

You can’t exactly “Tween” it however, you can use a loop to change the size of a particle emitter.

Check out NumberSequences: