CKEditor's "upload" tab will submit a file in the field "upload" - in PHP, that goes to $_FILES['upload']
The sentence above is taken from: How can you integrate a custom file browser/uploader with CKEditor?
My problem: after selecting a file from my local Windows hard drive and hitting the "Send to server" button, the file is not accessible in $_FILES['upload'], more specifically, the $_FILES array is empty.
Does anyone have an idea what I might be doing wrong? Thanks for your support.