You may have error reporting set to very low have you checked error_logs.
Have you got your directory set to 777 permissions?
I got this to work
<?php
if (isset($_POST['submit'])){
if (is_uploaded_file($_FILES['file1']['tmp_name'])){
$fullres=$_FILES['file1']['name'];
move_uploaded_file ($_FILES['file1']['tmp_name'],"../images/fullres/".$fullres);
}
if (is_uploaded_file($_FILES['file2']['tmp_name'])){
$photo2=$_FILES['file2']['name'];
move_uploaded_file ($_FILES['file2']['tmp_name'],"../images/screenshot1/".$photo2);
}
if (is_uploaded_file($_FILES['file3']['tmp_name'])){
$photo3=$_FILES['file3']['name'];
move_uploaded_file ($_FILES['file3']['tmp_name'],"../images/screenshot2/".$photo3);
}
if (is_uploaded_file($_FILES['file4']['tmp_name'])){
$photo4=$_FILES['file4']['name'];
move_uploaded_file ($_FILES['file4']['tmp_name'],"../images/".$photo4);
}
if (isset($_FILES['zipfile']) && is_uploaded_file($_FILES['zipfile']['tmp_name'])){
$zip=$_FILES['zipfile']['name'];
move_uploaded_file ($_FILES['zipfile']['tmp_name'],"../zips/vault/".$zip);
}
}
echo "<form action='fileupload.php' method='post' enctype='multipart/form-data'> ";
echo "<td><input type='file' name='file1'></td></tr>";
echo "<td><input type='file' name='file2'></td></tr>";
echo "<td><input type='file' name='file3'></td></tr>";
echo "<td><input type='file' name='file4'></td></tr>";
echo "<input type='submit' name='submit' value='Submit'></form>";
?>
However I had the absolute path to the directory you may want to change that as well.