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Minecraft | How to Merge the Nether/End into the World Folder

This process will convert your world_nether and world_the_end to your world folder.
This process is a must if you want to still use your Nether world and End world when converting to a Vanilla version especially with 1.17. Spigot/Paper to Vanilla

**Stop** your server first from the console.

Go to this link and Learn How to use SFTP

Once you're done, you should now be able to see a thing similar to this.

Converting Nether World Folder to World(Overworld) Folder

Open world_nether folder

Drag DIM-1 to world folder above.

Converting End World Folder to World(Overworld) Folder

Open world_the_end folder

Drag DIM1 to world folder above.

Checking if End World and Nether has been merged with World Folder.

Open world folder.

If DIM1 and DIM-1 are in the world folder, means it has been merged.

All done! You just merged your nether and end world with world folder!
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