@frangio Also another follow up question. If I understand this correctly, functions of the proxy itself (not the implementation contract) can only be called by ProxyAdmin. How can we get the ProxyAdmin object? I have only seen docs on using the Upgrade Plugin (i.e. the upgradeProxy function) to update a proxy's implementation.
Edit: nvm I think Error: No ProxyAdmin was found in the network manifest - #2 by ericglau answered my question. For those who might have the same question: for uups standard, there is no ProxyAdmin, and the deployer of the proxy can directly call those proxy admin functions (e.g. updating implementations)