I like the suggestion and tbh I've been thinking about your feedback all day and I came up with a solution. I am considering changing the uploading phase so that instead of waiting, you'll have to click a button which appears randomly (or will stay in place. I have yet to decide) and you'll have to click it more times depending on the file size.
Yeah, fr about the time pressure. I felt it so much too. Was looking like this to finish the game.