How to move Inbound Multipart form-data file from tmp directory

Try just

$local = $inboundFaxLocation;

$_FILES['attachment']['tmp_name'] should already contain a full path to the temporary file, there's no need to add the original name as well.

P.S. Normally in PHP people use move_uploaded_file() specifically for the purpose of transferring an uploaded file from its temporary uploaded location to a more permanent one - there's no point in copying really, because the temp file will be removed anyway after a period of time when the script ends.

Final code that worked for me.

 move_uploaded_file($_FILES['attachment']['tmp_name'], "/var/www/html/new_home/" . $_FILES['attachment']['name']);