File not uploading PHP

Make sure that in your form.. you put the enctype.
eg: <form method="post" enctype="multipart/form-data" action="index.php"></form>;

To check if files are successfully updated upon submitting the form. use print_r to see results.
print_r($_FILES);

make sure media folder has 777 permission and the path ../media/ is correct

Put the encription in form

<form method="post" action="index.php" enctype="multipart/form-data"></form>

Check in php.ini file max_execution_time heavy images are not uploaded due to execution time..