You have multiple options:
- When uploading individual files, make sure they have different names, so they won’t overwrite each other. A common notation is to add the platform in the name (ex. “my_game-windows.zip” and “my_game-linux.zip” etc).
- When using butler, make sure to use a different channel name for each platform you upload. One solution is to name each channel based on their platforms.
Hope that helps. I’ve used both methods on my own projects, so if you get stuck somewhere I should be able to help further.
Cheers!