Hello @jwaresolutions
I’ve found this error while I was working on it yesterday 
client intended to send too large body: 5395137 bytes, client: [xxx.xxx.xxx.xxx], server: [xxx.xxx.xxx.xxx], request: “PUT /groups/40146767-c175-470a-80b4-d4c0af3124d6.json?api-version=v2 HTTP/1.1”, host: “[xxx.xxx.xxx.xxx]”
I also found this post : The server response could not be parsed - Installation Issues - Passbolt community forum
I’ve tried to change the value of the setting client_max_body_size into the nginx conf, but unfortunately, I still have the issue.
Did you tried it on your side ?