If you decide to use indexed mode in aseprite, you have to add a new color to the start of the imported palette. If you don't, you will end up not being able to use the first color in the sprite (aseprite wants that one to be transparent).
I use asesprite but idk what is indexed mode in asesprite
it basically stores the color as where it is in the palette as opposed to rgb values
oh ok
I use it to prevent me from being able to use any other colors.
idk how to activate it btw