you have a couple problems:
1) The form tag:
<form class="Basic_Default" id="Update_Basic_Default" name="Update_Basic_Default" method="post" action="<?php echo(htmlentities($_SERVER["PHP_SELF"], ENT_QUOTES)."?".$_SERVER["QUERY_STRING"]); ?>">
does not have the encoding set. in the tag selector, select the form tag and set the encoding type to multipart/form-data
2) In the upload behavior, you have it set to use a file field name Image, but the form field is actually named img. you will need to edit the upload behavior and bind it to the correct file field.