this article may provide some assistance https://ww.wp.xz.cn/support/article/changing-the-site-url/
Have you also looked into .htaccess 301 redirects?
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This reply was modified 4 years, 3 months ago by ehrothpress.
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This reply was modified 4 years, 3 months ago by ehrothpress.
Wordpress has an article “Get a faster, more secure website: update your PHP today”.
It talks about steps to take before updating the PHP version and checking with your hosting provider about how to update the php version for their server.
you might want to set up a separate local installation first and test your theme with the upgraded WordPress version on that separate WordPress installation.
I found something in an article that says to check at the top for screen options and see if featured image is checked
