Error uploading docs, pdf, jpg using php - php

Question

Please am trying to upload docs, .docx, .pdf, .jpg files using php but each time I click on the upload button, I get this message: "uploadedFile format not supported! uploaded".
Please where is the problem coming from? It is supposed to be either 'uploaded' or 'file format not supported'.
Thanks.
<?php
require_once "include/db_handle.php";
if (isset($_POST['upload'])) {
if (!empty($_FILES['_file']['name'])) {
if ($_FILES['_file']['type'] == 'application/msword') {
$upload_folder = "./file_doc/";
$pic_name = time() . ".doc";
$pic_path = $upload_folder . $pic_name;
move_uploaded_file($_FILES['_file']['tmp_name'], $pic_path);
$upload = "INSERT INTO tfiles (name) VALUES ('$pic_name')";
if ($db->query($upload)) {
echo "uploaded";
}
}
if ($_FILES['_file']['type'] == 'application/vnd.openxmlformats-officedocument.wordprocessingml.document') {
$upload_folder = "./file_doc/";
$pic_name = time() . ".doc";
$pic_path = $upload_folder . $pic_name;
move_uploaded_file($_FILES['_file']['tmp_name'], $pic_path);
$upload = "INSERT INTO tfiles (name) VALUES ('$pic_name')";
if ($db->query($upload)) {
echo "uploaded";
}
}
if ($_FILES['_file']['type'] == 'application/pdf') {
$upload_folder = "./file_doc/";
$pic_name = time() . ".pdf";
$pic_path = $upload_folder . $pic_name;
move_uploaded_file($_FILES['_file']['tmp_name'], $pic_path);
$upload = "INSERT INTO tfiles (name) VALUES ('$pic_name')";
if ($db->query($upload)) {
echo "uploaded";
}
}
if ($_FILES['_file']['type'] == 'application/vnd.openxmlformats-officedocument.presentationml.presentation') {
$upload_folder = "./file_doc/";
$pic_name = time() . ".pptx";
$pic_path = $upload_folder . $pic_name;
move_uploaded_file($_FILES['_file']['tmp_name'], $pic_path);
$upload = "INSERT INTO tfiles (name) VALUES ('$pic_name')";
if ($db->query($upload)) {
echo "uploaded";
}
}
if ($_FILES['_file']['type'] == 'image/jpeg') {
$upload_folder = "./profile_pix/";
$pic_name = time() . ".jpg";
$pic_path = $upload_folder . $pic_name;
require_once "include/resize.php";
if (move_uploaded_file($_FILES['_file']['tmp_name'], $pic_path)) {
$image = new Resize($pic_path);
$image->resizeImage(180, 180, 'crop');
$image->saveImage($pic_path);
//thumbnail
$image = new Resize($pic_path);
$image->resizeImage(50, 50, 'crop');
$image->saveImage($upload_folder . "thumb/" . $pic_name);
}
$upload = "INSERT INTO tfiles (name) VALUES ('$pic_name')";
if ($db->query($upload)) {
echo "uploaded";
}
}
else{
echo "File format not supported!";
}
}
}
?>
HTML Form
<p class="points" > Add Files</p>
<form name="" action="" method="post" enctype="multipart/form-data">
<input type="file" name= "_file" />
<input type= "submit" name="upload" value="upload"/>
</form>