Hi @james2412 - sorry for the delayed response. Updates.reload will make the app act as if it were starting up for the first time again, so it will use whatever updates configuration is in app.json to load the app. So if you have a non-zero fallbackToCacheTimeout, Updates.reload will try and fetch the newest version from the server each time you call it.
On the other hand, Updates.reloadFromCache will use the already downloaded version regardless of your updates settings in app.json.