It would be nice to have some step by step tutorial for this mod, figuring out how to even edit in it was hard enough. I pasted the text the export gave me into a gist, and I wrote in the URL of my gist (because ctrl shortcuts crash the game) but it said unknown URL, I checked many times to see if I wrote it right and I did. Is there an easier way to export and use the 3D skin?

Please send in your crash report, the game shouldn't crash with pasting a link.

crash-2021-02-11_20.51.24-client.txt
This is the whole crash report, it crashes the whole game whenever I use any keyboard shortcut involving the ctrl or shift key as soon as I press down any other key while holding one of those two.

Your game crashes because of this: grondag/fermion#2 you have to update your mods, or try using the editor in a new install by itself without any other mods installed.
You are using an outdated version of https://www.curseforge.com/minecraft/mc-mods/exotic-matter-library you should probably update that.

I don't have that mod, but I do have an outdated version of https://www.curseforge.com/minecraft/mc-mods/exotic-blocks which requires it, though the exotic blocks mod works in the game. I'll get the newest version of both and then inform you if it works after that.

I was able to paste the link fine now. It was that mod causing the problems, I still don't understand how to actually use the 3D skin. I uploaded the exported png as my skin but it was just the vanilla skin without the 3D objects I added in the editor. Am I supposed to do something specific during the export?

You probably have to update to the latest version of Customizable Player Models due to a skin loading bug.

I went for the latest 1.16 file since I run fabric on 1.16.4. I'll try the mod version for 1.17, the very newest one

The 1.16 version is fine, the 1.17 one wont load under 1.16.4. The latest is 0.0.7b

It says "unable to load skin" in the skin changer in the launcher when I tried to use the on I put the exported png on. The preview of it shows just the normal vanilla skin without the slight texture changes I made in the editor.

If you edit your skin in the editor it won't show up in the minecraft launcher, the modified skin is in the gist file, with your model parts.

When I try to load the one from the exported png, it says that it was unable to load it and when I go into a world, my skin is still normal.

Please post the exported png.

Try restarting your launcher, mine accepts it.

It works now! Thanks so much for the help! I'll close the issue now, thanks again!