also you said it was in the text document but when i looked at the NuclearThroneTogether but I didn't see it so which one are you talking about?
From the text document:
/loadsprite [sprite name] [file name] Replaces the given sprite with file' contents. Files should reside in "images" subdirectory of the game. File names can have `_stripN` or `[N]` suffix to denote the number of frames included. For list of modifiable sprites, see https://bitbucket.org/snippets/yal_cc/jxLMx