How to delete Hidden folders in windows phone 8.1

[Arvind gr]

Hi am using Lumia 730, in my phone storage some music files are hidden and they will not show up in phone but i can see them when I connect my phone to pc and i am not able to delete them and unhide them.

Those hidden folders/files have taken 1GB storage of my phone.
Please suggest me the solution for this problem.

 

[irtiza_fayaz]

Screenshots?