Http to https content problem

Hi,
I changed prefix from http to https from settings for SSL. After that, the images I put in the pre footer began to give an error as shown in the attached. In Settings, I changed https back to http, but the problem didn’t improve. I deleted the images and reinstalled them again. I’ve had this problem without installing any plugins. I’ve installed and deleted many different plug-ins to solve, but there was no improvement. I know there is an error caused by the URL. The site is currently running on the local server, and when I transfer it to an SSL-installed domain, will this problem be solved? How can I solve this problem locally?