Those steps is correct, but there’s additional procedures that need to happen first. My method isn’t elegant, but it works.
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I first get the .jar file on the computer (I create a folder for everything to be dumped into). You should be able to use the one obtained in MineOS in the /profiles directory.
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I open a command prompt or terminal and enter the command:
java -Xmx1024M -Xms1024M -jar serverfile.jar nogui
2a) accept the eula
2b) enter the same command, and when the server is ready enterstop
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Remove or delete the resulting “world” folder contents and replace the world to be imported into that folder.
— you can rename the world folder, but it will need to match the same name in the server.properties file. -
Archive the entire “dump folder” and transfer that to the import directory on your MineOS server.