Check edition and version compatibility before uploading the world. Preserve the option to return by downloading the current Aternos world separately.
Step by step
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Stop the Aternos server. Worlds or download the current world from the Worlds section.
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Check that
level.datis at the root of the world folder you will upload to. If you're uploading an archive, remove unnecessary upper folder layers. -
Select the file from the world upload tool in the panel. If it doesn't meet the file type and size limit supported by the platform, edit the file first.
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Open the server and check the coordinates, spawn point and required dimensions of a known structure.
Keep in mind
Java and Bedrock world archives are not directly installed interchangeably.