Things to be Remembered
-Your phone must be rooted & should be running android lollipop.
-Download Galaxy S6 My Files and transfer it to your phone.
-Download Es File Explorer or any other root folder.
How to install:
-Open Es File Explorer/tap on menu/tap on tools & enable root explorer.
-Now select the transfered downloaded S6 My Files by giving long press on the file. Copy the file from the bottom options.
-Now go to Device(root folder)
-Select System/priv-app/select SecNoteMyFiles or SecMyFiles & paste the copied file here.
-Now again give a long press on the pasted file then select more option from bottom.
-Here change the permissions as rw- r– r– & Select ok
-Now give a long press on the default MyFiles apk(which is already in the present folder).
-Cut the file from the bottom options and paste in Device Storage or SD Card. So that you can revert the process if you want the Default MY Files back.