I downloaded the map my friends and I were playing on before we began to joke around in creative mode
Afterwards, I reuploaded the downloaded map on the aternos worlds tab
After turning on the server, the structures on the map are gone and are replaced by the Minecraft generated terrain.
Though, all the items that were in the inventory still remains
Edit: I've done some testing, all Attack of the B-Team maps works, and any single player worlds that I create stays the same as it was on aternos and on singleplayer. Only the map my friends and I were playing do not save when transferring from single player to aternos.
