How to get an image from a prefab?

Question

Unity

There is a source code of the game (Mario). It has a prefab that is responsible for the textures of Mario in different positions.
When the list is opened, all possible positions appear, and not only:


But when I try to open each position for viewing, the whole picture opens.

Simply put, I need to replace Mario with my character, completely replacing any possible position with the file I need.
Source:
https://github.com/linhdvu14/SMB-clone

Answer 1

This is a sprite map.
You need to rebuild the spritemap, or replace all the images with your own while keeping the map grid pixel-for-pixel (i.e. without breaking block separation). Those. create the same placement of animations and "paste" into this "top". In Photoshop, for example.