Guide to Creating Custom Minecraft Instances

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OS Name/Version: Debian 12.2

Product Name/Version: Currently running version 2.4.6.6 - 20231005.1

Problem Description:

I want to configure a custom minecraft server (In this case, Gregtech New Horizons) and was hoping for a guide on how to do custom in general.

I tried uploading all the files into the created instance folder (after creating an ftb instance to see how it worked), but it says I’m missing custom arguments.