Folders Menu always Empty even i also give the 'Storage Permission'

Expected behavior

There is an Folder option in Side Menu bar of Retro Music Player it must show all the folders of SD card or Internal Storage. This Folder option is for to add music manually to the app. I expext that it shows my folders but i am wrong.

Actual behavior

I open the Folder option that is on the slide bar Menu of the Retro Music Player and i see nothing only it displayed the Empty then i check the storage permission for this app and it is already allowed to the app but the app show Empty always i try this option. Developer should fix this option to enhance the functionality of the app and make it bug free.

How to reproduce

Open the RetroMusic Player and open slide menu by click on the option button and select the Folder option. You can see here it shows the Empty also check you storage permission for this app and check this folder option again as shown in these screenshots.

• Click on option
  
• Open Folders and also check that storage permission for it. Make sure it allowed
  
• Now open Folders option
  
• Its Empty always give empty message for internal memory.
  

• Retro Music Player: Version R-1.4.PRO_20180314
• Operating system:Android Nougat 7.1

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