Laravel Storage can't delete file

I can't delete the file uploaded to storage/app/

ErrorException in Local.php line 244:unlink(...app\6d951c00-c27c-11e5-99ea-f72a932e14c5.zip): Permission denied

I have given full control - full read, write, modify permission to user for the storage folder. What more can be the cause?

via Chebli Mohamed