Please try to upload the world, then disable optimize on the worlds page
It worked! Thank you so much 
Posts by adagesmp
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Hi! I've been trying to upload one of my personal worlds to aternos, but every time I do it, the world gets corrupted! I've uploaded it with the file both zipped and unzipped but it appears that new chunks/biomes spawn where they're not supposed to be. i.e. a snowy hills biome spawning directly in the middle of what was a plains village. I do have builds and plan on turning this server into an SMP so I don't really want to have to start from scratch/play on a corrupted world! I've attached an example of the world being corrupted. I'm not sure how to fix this
please help!