How can I completely disable Cloudflare's caching for a specific URL or file type?

You can disable Cloudflare caching using Page Rules. Create a Page Rule that matches the specific URL or file type (e.g., `/wp-admin/*`, `*.php`). Set the 'Cache Level' to 'Bypass' and ensure that 'Edge Cache TTL' is set to 'Bypass'. This ensures that Cloudflare doesn't cache these requests.