If your phone supports USB OTG  (USB On-the-go), you can view the files and folders from your external USB storage  on your phone.
- 
Connect a USB OTG connector to your phone and your external USB drive.
- Do one of the following:- Tap the name of your USB drive.
- Go to . Tap  , and then tap the name of your USB drive. , and then tap the name of your USB drive.
 
-  Navigate to the file or folder you'd like to open.
You can also manage your files and folders from your USB drive  using the HTC 
File Manager app. 
Note: If HTC File Manager is not preinstalled, you can download it from Google Play.