Your form action is set to post to a page called "uploader.php"... maybe that was an old page you were using?
<form action="uploader.php"
just remove that in your form and it should submit to itself like:
<form action=""
What issues are you having with the updates? If you are more specific I can help you with them.
The trigger dropdown list can be used for common triggers. Only use the lighting bolt if you are an advanced user that is doing something special.