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Hello, I made an import to edit the "Mortal Kombat 2" screen for the NES, I already edited it but I don't know how to export it to the game now, when I use the "Export -> put CHR into nes file" option, I open the rom and continue with the same screen as before editing. How can I make the new design stay in the rom?

Before:

Import:

Select title:

Image to edit:

After:

edited screen:

There are no changes:

But I have noticed that in the "Tileset" session there are no changes and when exporting it returns the same without changes. What can I do to keep the changes in the rom?

I need help please