Upload library - file not uploading - Need help debugging

Hi guys
I'm having some trouble with the uploading class

My config/upload.php

Code:

$config['upload_path'] = '/home/kike/www/servijus/_files/';
$config['allowed_types'] = 'xls|xlsx|csv';
$config['detect_mime'] = true;
$config['max_size'] = 0;

And I'm "debugging" with these lines in my Excelupload controller

Code:

$this->load->library('upload');
$this->upload->do_upload('excel_asignaciones'); // custom field name
echo "<pre>";
print_r($this->upload->data());
echo "</pre>";
exit();

I guess that If upload->data() is called and the values show fine, file upload was correct, right?
My problem is that I don't see the file in the "_files" folder, which has chmod 777. Also, disabling "detect_mime" config does not work



PS: sometimes I get the The filetype you are attempting to upload is not allowed. message but I have this in config/upload.php

Code:

$config['allowed_types'] = 'xls|xlsx|csv|ods';

Update:

Seems an error related to file_type => "application/cdfv2-corrupt" error that can be seen in the image above.
I've created a new excel file from scratch, uploaded, and worked
Just wonder how to solve that application/cdfv2-corrupt thing, because the other xls files can be opened correctly

Enrique
https://beza.com.ar