### Answer
I'm sorry to hear about the issues you're encountering with Vapi. It seems like there might be a technical glitch or a recent change in the platform's behavior that's affecting your ability to save, modify, or duplicate assistants, as well as upload documents to the Knowledge Base. Unfortunately, the provided documents don't cover a direct solution to the problem of assistants not saving or reverting changes upon exiting Vapi.
However, similar issues of saving changes or publishing modifications have been discussed within the community. For instance, there have been mentions of problems with functions, especially when they have multiple properties, and issues with specific property names like "description" causing save and publish actions to fail [(1)](
) . The advice given includes making changes one at a time and saving after each change, which might offer a workaround for your situation too.
If your issue persists, it might be beneficial to check if there have been any updates or maintenance activities on Vapi that could be temporarily affecting its functionality. Keep an eye on any official channels or forums where such information might be shared.