One of the Main drawback of Windows phone was it doesn’t had a working native file manager and Microsoft was working on it. Now File Manager is here. The file manager App for Windows Phone is now officially available from the Windows Phone Store.
The App Is name ‘Files’ and it can be used to access all the data storage devices like phone internal memory and SD Card. You can also use this app for searching , launching files . The File Manger also Gives you ability to share multiple files, create folders to organize copy, move, rename or delete existing data.
They may add it on next update but for now the app is on windows store