Factorio saves are single zip files, which makes this one of the easier games to move. Don't unzip it: the server wants the zip exactly as it is.
- In the panel, stop the server from the Console tab.
- On your PC, find your save. On Windows it's in
%appdata%\Factorio\saves, with a name likemy-factory.zip. - In Files, open the
savesfolder. - Upload the
.zipas it is. - If the server loads a save by name, either rename your upload to match or change the name on the Startup tab.
- Start the server and watch the console. It prints the name of the save it loaded, which is the quickest way to check it took yours.