Error in Move function when upload file in laravel

foreach($messages as $singleMsg) {
    if ($uploadedFile) {
         $selectedMessageReply = MessageReply::where('msg_id', $singleMsg)->first();
         $selectedMessageReply->is_attachment = 1;
         $selectedMessageReply->save();
         $extension = $uploadedFile->getClientOriginalExtension();
         $uploadedFile->move($pathToFile.$singleMsg, $selectedMessageReply->id . '.' . $extension);
   }
}

This code works file if without loop and work with single object but when I use this code inside loop , the move function gives The file "app.zip" was not uploaded due to an unknown error., so What is the problem and how to fix it ?

via Chebli Mohamed