Empty check in condition is being bypassed and running

I have a form where users can attach a file and send. I am noticing when users submit the form without an attachment that this condition is still running:

if (!empty($_FILES['uploadedFile']['name']) && $_FILES['uploadedFile']['error'] != 4)

I cannot figure out why it would be running through since the filename would be empty.

Does anyone have any idea why the condition is still running?

   if ($_FILES['uploadedFile']['error'] == 1) {
        $error = "The file {$_POST['first_name']} attempted to upload is too large. Contact them for an alternate way to send this file.";
        $template = str_replace("{filename}", "$error", $template);
    }
    if (!empty($_FILES['uploadedFile']['name']) && $_FILES['uploadedFile']['error'] != 4) {
        $fu = new fileUpload();
        $filename = $fu->upload();
        $out = (count($filename) > 1 ? 'Multiple files were' : 'A file was'). '  uploaded. You can download ' . (count($filename) > 1 ? 'them' : 'the file'). ' from:</ul>';
        foreach ($filename as $indFile) {
             $out .= "<li><a href='/uploads/{$indFile}'>{$indFile}</a></li>";
        }
        $out .= '</ul>';
        $template = str_replace("{filename}", $out, $template);
        clearstatcache();
    } else {
        $template = str_replace("{filename}", "", $template);
    }

HTML:

<input type="file" name="uploadedFile[]" id="uploadedFileTest" multiple>
<button type="submit">