upload files using windows explorer instead sharepoint 2013 not working OFFICE 365

Step 1 : Close all your browsers and browse the library that you want to open in explorer.
Step 2 : while login to office 365 TICK KEEP ME SIGNED in check box.

if step 2 : fails

Step 1 : Close all your browsers
Step 2 : Restart WEBCLIENT Service
Step 3 : browse the library that you want to open in explorer.
Step 4 : while login to office 365 TICK KEEP ME SIGNED in check box.