This should be a very simple question to answer, but I can't find it in the documentation. While playing the uploaded version of my game, I can save a game but I can't find how to reload the saved game. In the desktop I know that you have to load the saved game as a complete game file, but does a version of this work online?

When you look at the listing for your game (the page with the comments and reviews at the bottom), if you have previously saved a game the big green 'Play' button will be replaced by 'Resume' and 'Restart'.

Note that (unless it's changed since last time I tried it), saved games online will be discarded if you aren't logged into the site while playing, or if the game hasn't been published.

OK, thanks. If someone beta-tests the game, will they need to be logged in to the site?

If they want to save while playing online, I believe so.