I found the following open thread thread I followed it exactly as descript.
The sixth slider showed in the admin panel and I was able to upload the image but when I upload the image nothing is shown on the slider.
If there is any other function or array that need to be edit please let me know. Your help is really appreciated.
Link to the web page if needed:
One more thing I am using child theme also.
Thank you for the hard work and dedication.