This is way there must always be a co-host
i was looking around and it looks like you can allow late submisians
https://itch.io/updates/enhancing-jams-late-submissions-and-entry-editor
https://itch.io/jam/322810/add-game/1635726/5799055?token=n9p7sordRwGcmYCGUKYlqZCk9U8
This will permise you to submit late your game.