Looks like it has an ARM CPU, a RK3588. Similar ballpark to a Pi 5 in CPU performance.

Installing another OS would be technically possible but not easy, you’d need a Linux kernel with the RK3588 drivers already in it. Then there are differences between it and other RK3588 SBCs that could cause problems.

Much like you wouldn’t want to install anything other than raspbian on a Pi, you’d be best off with ugreen’s OS even if others are technically possible.

Sorry I might have misunderstood, you mentioned giving others access externally and it working fine. Normally, if you’ve set up the service to be publicly accessible on the internet, you can just visit the same site through the public DNS record and your public IP. At home or elsewhere, it’s all the same internet.

So either you’ve done something odd, or you’re talking about different, more private, internal only services?

Can you live with the services routing out and back into your public IP? If it all works for external users on the internet, doing nothing special should mean it works for you too?