ES File Explorer detects external hdd but cant access files inside

Hey guys so i recently bought a otg cable and was trying to get my Samsung Galaxy Note 5 to read my WD hdd. So i downloaded ES File Explorer and was trying to get it to read it. The problem is that it is able to detect the hdd but when i click on it, it fails to open the file. I've tried it with my pendrive and it seems to work fine. And i've also reformated my hdd to exfat.

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