RSS Feed/News file_exists issue

[ENXF NET]

I have this code:

Code:

$dataDir = \XF::app()->config('externalDataPath');
$fileDirectory = $dataDir. '://ill/upload/';
$filename = $signupUsername.'_'.$signupFilename.'.mp3';

if (file_exists($fileDirectory.$filename)) {
 \XF\Util\File::deleteFromAbstractedPath($fileDirectory.$filename); 
}

but for some reason file_exists isn't working. Deleting the file is fine, and I've checked all the paths, so I'm assuming there's a problem with file_exists checking inside the data folder? Any ideas?

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