Nordin

@hessam68888 I found a fix working for me. You need to use mime type text/plain to make CSV uploads available.

// add csv
function edit_upload_types($existing_mimes = array()) {
    // allow .woff
    $existing_mimes['csv'] = 'text/plain';

    return $existing_mimes;
}
add_filter('upload_mimes', 'edit_upload_types');