The location of the save file...

[별하나에]

D:\DOWNLOAD\Steam\steamapps\common\Stranded Deep\Stranded_Deep_Data
I know it's here. There are four places to save and what do you need to modify to copy Multi World 1 to World 2? I tried to change the file name from 1 to 2, but it has not been modified.

[Nacho Meal Ticket]

C:\Users\Your_Name\AppData\LocalLow\Beam Team Games\Stranded Deep\Data