https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-admin/zone-protection-and-dos-protection/zone-defense/packet-buffer-protection

According to the Palo Alto Networks documentation, "The PAN-OS software now includes a native SD-WAN subscription to provide intelligent and dynamic path selection on top of the industry-leading security that PAN-OS software already delivers. Key features of the SD-WAN implementation include centralized configuration management, automatic VPN topology creation, traffic distribution, monitoring, and troubleshooting."

You can create a custom app: https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-admin/app-id/use-application-objects-in-policy/create-a-custom-application or submit a request to PAN https://www.paloaltonetworks.com/blog/submit-an-application/

https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClMnCAK

b) Explicit proxy allows for easier troubleshooting, since the client browser is aware of the existence of the proxy12. This means that the client can see the proxy's IP address and port number, and can use tools like ping or traceroute to check connectivity and latency issues. Transparent proxies are invisible to the client browser, which makes it harder to diagnose problems.
c) Explicit proxy supports interception of traffic using non-standard HTTPS ports3. This means that the proxy can handle HTTPS requests that use ports other than 443, which may be required by some applications or websites. Transparent proxies can only intercept HTTPS traffic on port 443, which limits their functionality.