anchor.diff:                  id = <<"s3_timeout">>,
                   style = <<"width: 30em; display: block">>,
                   placeholder = <<"Timeout [ms] (optional)">>
  +            },
  +            #flatui_checkbox{
  +                label_id = <<"s3_sig_v2_checkbox">>,
  +                label_style = <<"width: 20px;">>,
  +                label_class = <<"checkbox">>,
  +                delegate = ?MODULE,
  +                postback = sig_v2_toggled,
  +                body = <<"Signature version 2">>
               },
               #flatui_checkbox{
                   label_id = <<"s3_readonly_checkbox">>,
  
positive.code: event(readonly_toggled) ->
      get(comet) ! readonly_toggled;
  
  event({close_message, MessageId}) ->
      gui_jq:hide(MessageId);
  
  
negative.code:                 Readonly = maps:get(readonly, State, false),
                  maps:put(readonly, not Readonly, State);
  
              sig_v2_toggled ->
                  SigV2 = maps:get(sig_v2, State, false),
                  maps:put(sig_v2, not SigV2, State);
  
              {ceph_submit, <<>>, _, _, _, _, _, _} ->
                  onepanel_gui_utils:message(error, <<"Please provide admin username.">>),
                  State;
  