UAP Technology Origins - Ancient Civilisation or Off Planet?

Finally got round to watching the latest Bob Lazar S4 documentary on Amazon Prime which although doesn't bring a lot of new information to the. table, it certainly helps to string it all together in a visually inspiring format - such as the reactor/amplifier/emitter combo outside the vessel. What has been nagging me are questions around the true origin of this technology. Based on what I've read: Bob Lazar claims that the craft (the "sport model") he was working on was recovered from an arche...