seems to be getting caught in the front end console,
VM242:1 POST http://XXXX/give_answers 413 (Request Entity Too Large)
So it's on me and my NGINX config.
For anyone else that finds this and is using NGINX the solution was to add and up the client_max_body_size
in the appropriate NGINX config file (Module ngx_http_core_module). eg,
client_max_body_size 50m;