Did you set the featured image? No it does not need any other additional file. Just once deactivate all the plugins and re check there page/ post id whether there is featured image or not. It would be great if you provide the Site Url too.
We have fixed your issue. Just once visit to your site. The error is that you have added a iframe code (google map) in footer column third but there is not end of iframe code. We have fixed it and not your footer and slider both are working fine.
We have spend lots of time and efforts to develop this theme available free for you.
Could you also please help us rating this theme in WordPress Repository. https://wordpress.org/support/view/theme-reviews/interface
We really appreciate your rating.
I have another issue with the theme.
I am customizing the theme, and after some hours, the original configuration of the theme come back and subscribe my customizations. It is deleting a specfic folder that I created on the server too!! Never seen this before on WordPress!
What can you say about this issue?
Thank you in advance.
Did you update the theme? If you have customized the code without making a child theme then while updating to our new version all your customized code will be lost. So we always recommended you all to create a child theme before making any changes in the theme.