I downloaded some files and saved them in a folder on an external hard drive. Later when I am trying to search for the folder I couldn't find it. So I try searching using the terminal. I listed all the files in the location where I had saved that folder previously and noticed the folder was present there but it showed `d?????????` permission. What does it mean and how can I get my files back.

```
drwxrwxrwx 1 chetan chetan      4096 Jun 12 21:55 'Money Heist'
d????????? ? ?      ?              ?            ?  Naruto_Shippuden
drwxrwxrwx 1 chetan chetan      4096 Jul 20 23:51  Parasyte

```