Fix artifacts from Steam's gif compression

Short guide on how to fix gif compression artifacts here on steam.

The problem and the fix

I had a few projects where an animated gif I shared on steam had strange artifacts.
In the above image you can see difference between a frame with artifacts and what I was expecting.
If you ever run into this and want a quick fix:
When you export animation you select gif in the first window that pops up.
In this window disable "Optimize File Size" (which is on by default).


This fixed the problem but the file got four times bigger.
I guess, you cannot have it all.
Hope this helped.