MY_Upload to work with Flash-Uploads (application/octet-stream)

[eluser]Ignacio[/eluser]
Good good, excelent.

But I don't know why, I'm uploading a jpg pic and FileType retrieve me image/png.

The problem is here:

Code:

if (in_array($this->file_type, $png_mimes))
{
    $this->file_type = 'image/png';
}

Any way to solve this?