How do you change the frame an animation starts on for a character? (Psych Engine, no lua)

Anybody know/got any ideas on how to make a trail for an animated sprite rainbow? I don't want to make like 40 colored sprites just to make a rainbow trail, so if there is a way I can do it without any new sprites, it would be much appreciated.

i updated my mod: https://gamejolt.com/games/2014/686753

how do you announce an update to a mod without sounding cringe

I made a mod I think https://gamejolt.com/games/2014/686753

made in like a day

How do people make XML pixel sprite sheets? I know how to make a normal sprite sheet, and I have aseprite, but I don't know how to use aseprite to get an XML spritesheet. Can I import it into Adobe Animate and then export it as an XML?