Pixelmon is a mod that allows a lot of customization, one of them being able to change the spawn of every Pokémon, item, and more.
I have every single Pokémon with its own spawning system changed for customization purposes, and I wanted to make a server with these custom spawnings and custom loots, but since Aternos doesn't allow people to drag and drop files, I'd have to copy and paste each file individually, and they're more than 900 files.
My suggestion basically is to make people able to drag and drop files for Pixelmon customization purposes, that way we don't waste hours of our life doing something we already did before.