Itch does not provide this option now!

There is a kludge: copy your game.zip into game0.zip and upload both to your project!

Feel free to respond with other games that got this to or ask me for help!

These are downloadable browser games

https://auoroa.itch.io/easy-dancer 

https://auoroa.itch.io/color-typer

https://stext25.itch.io/run-cherry-run

I upload dancer.zip for the