How do I Import my own logos

Im just now getting back into modding 2k21 after not playing it for several months but I do not remember how to import my own logos to the logo.iff files

It's basically the same as NBA 2k14. I think JaoSming made a tutorial. Make a copy of the original file first. Paste the new logo over the old. Delete the old alpha channel. Create a new alpha channel. Save the file. Here's the format for the logos I have edited. Remember to edit the TXTR file. I'm sure logo.iff files are similar. Never edited that file.

logo999 - mips 11 - BC7 fast linear DX11+
logo999_wm - mips 10 - BC7 fast linear DX11+