ah, yes! I remember now, I watched brackey's video but he uses photoshop. I use krita but krita doesn't have (as far as I found) an equivalent psd exporter like photoshop does. Thanks again!
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I use Krita too! It can export to psd but not psb, but there is a way to convert between the two. Export to PSD then convert the file to PSB using "magick". https://imagemagick.org/index.php
Idk if you can convert with the GUI but I do it from the terminal like so: "magick convert my_image.psd my_image.psb"