WP editor doesn’t load on localhost Synology

Hi, I just want to say hello and politely ask for advice if anyone would know. I am new to WP, I have successfully installed WP on Synology localhost, connected to cloudflare and successfully launched the site. I can't get any templates editing, Elementor plugin doesn't load the template editing page, WP editor doesn't load either. I've been at it for a week and google doesn't help, I don't know what to do. I've raised the php memory limit to 512, everything is updated, I've used php 8 even 8.2, safemod Elementor is not working either. The rights to the read and write folders are also fine. I don't know what procedure to use to check where the error might be. I'm a bit sad. Thanks for the help and advice.