When using two separate edit fields in Matlab app designer, how to save both into a text file?

When I want to save a couple of feedback options for a program I am writing, it overwrites the first option with the second option. I need both to save into a textfile called feedback.txt

Here is what I have now:

classdef TestApp < matlab.apps.AppBase
    % Properties that correspond to app components
    properties (Access = public)
        UIFigure                     matlab.ui.Figure
        Image                        matlab.ui.control.Image
        PassorFailButtonGroup        matlab.ui.container.ButtonGroup
        FailButton                   matlab.ui.control.ToggleButton
        PassButton                   matlab.ui.control.ToggleButton
        Ratethisfrom1to5ButtonGroup  matlab.ui.container.ButtonGroup
        Button_5                     matlab.ui.control.RadioButton
        Button_4                     matlab.ui.control.RadioButton
        Button_3                     matlab.ui.control.RadioButton
        Button_2                     matlab.ui.control.RadioButton
        Button                       matlab.ui.control.RadioButton
        DoyouhaveanycommentsorSuggestionsEditField  matlab.ui.control.EditField
        DoyouhaveanycommentsorSuggestionsEditFieldLabel  matlab.ui.control.Label
        HowdidthisfunctionworkEditField  matlab.ui.control.EditField
        HowdidthisfunctionworkEditFieldLabel  matlab.ui.control.Label
    end
    
    % Callbacks that handle component events
    methods (Access = private)
        
        % Callback function
        function PressthistomoveontonextfunctionButtonPushed(app, event)
            %end the current function and continue running program
        end
        
        % Value changed function: HowdidthisfunctionworkEditField
        function HowdidthisfunctionworkEditFieldValueChanged(app, event)
            value = app.HowdidthisfunctionworkEditField.Value;
            %When user types into box, save into file memory
            %value= value;  % Value entered in textArea
            %value = app.value
            writematrix(value, 'feedback.txt', 'QuoteStrings',false);
        end
        
        % Value changed function: 
        % DoyouhaveanycommentsorSuggestionsEditField
        function DoyouhaveanycommentsorSuggestionsEditFieldValueChanged(app, event)
            newvalue = app.DoyouhaveanycommentsorSuggestionsEditField.Value;
            %When user types into box, save into file memory
            writematrix(newvalue, 'feedback.txt', 'QuoteStrings',false);
        end
        % Selection changed function: Ratethisfrom1to5ButtonGroup
        function Ratethisfrom1to5ButtonGroupSelectionChanged(app, event)
            selectedButton = app.Ratethisfrom1to5ButtonGroup.SelectedObject;
            %When the user selects a button save their choice
        end
        % Callback function
        function DidthispassorfailButtonGroupSelectionChanged(app, event)
            selectedButton = app.DidthispassorfailButtonGroup.SelectedObject;
            %When the user selects a button, save their choice
        end
        % Image clicked function: Image
        function ImageClicked(app, event)
            %Zoom in image
        end
    end
    % Component initialization
    methods (Access = private)
        
        % Create UIFigure and components
        function createComponents(app)
            
            % Create UIFigure and hide until all components are created
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Position = [100 100 1062 470];
            app.UIFigure.Name = 'MATLAB App';
            
            % Create HowdidthisfunctionworkEditFieldLabel
            app.HowdidthisfunctionworkEditFieldLabel = uilabel(app.UIFigure);
            app.HowdidthisfunctionworkEditFieldLabel.HorizontalAlignment = 'right';
            app.HowdidthisfunctionworkEditFieldLabel.Position = [54 384 156 22];
            app.HowdidthisfunctionworkEditFieldLabel.Text = 'How did this function work?';
            % Create HowdidthisfunctionworkEditField
            app.HowdidthisfunctionworkEditField = uieditfield(app.UIFigure, 'text');
            app.HowdidthisfunctionworkEditField.ValueChangedFcn = createCallbackFcn(app, @HowdidthisfunctionworkEditFieldValueChanged, true);
            app.HowdidthisfunctionworkEditField.Position = [225 384 363 22];
            
            % Create DoyouhaveanycommentsorSuggestionsEditFieldLabel
            app.DoyouhaveanycommentsorSuggestionsEditFieldLabel = uilabel(app.UIFigure);
            app.DoyouhaveanycommentsorSuggestionsEditFieldLabel.HorizontalAlignment = 'right';
            app.DoyouhaveanycommentsorSuggestionsEditFieldLabel.Position = [8 315 248 22];
            app.DoyouhaveanycommentsorSuggestionsEditFieldLabel.Text = 'Do you have any comments or Suggestions?';
            % Create DoyouhaveanycommentsorSuggestionsEditField
            app.DoyouhaveanycommentsorSuggestionsEditField = uieditfield(app.UIFigure, 'text');
            app.DoyouhaveanycommentsorSuggestionsEditField.ValueChangedFcn = createCallbackFcn(app, @DoyouhaveanycommentsorSuggestionsEditFieldValueChanged, true);
            app.DoyouhaveanycommentsorSuggestionsEditField.Position = [263 277 325 60];
            
            % Create Ratethisfrom1to5ButtonGroup
            app.Ratethisfrom1to5ButtonGroup = uibuttongroup(app.UIFigure);
            app.Ratethisfrom1to5ButtonGroup.SelectionChangedFcn = createCallbackFcn(app, @Ratethisfrom1to5ButtonGroupSelectionChanged, true);
            app.Ratethisfrom1to5ButtonGroup.TitlePosition = 'centertop';
            app.Ratethisfrom1to5ButtonGroup.Title = 'Rate this from 1 to 5?';
            app.Ratethisfrom1to5ButtonGroup.Position = [114 182 414 52];
            
            % Create Button
            app.Button = uiradiobutton(app.Ratethisfrom1to5ButtonGroup);
            app.Button.Text = '1';
            app.Button.Position = [3 6 29 22];
            app.Button.Value = true;
            % Create Button_2
            app.Button_2 = uiradiobutton(app.Ratethisfrom1to5ButtonGroup);
            app.Button_2.Text = '2';
            app.Button_2.Position = [95 6 29 22];
            
            % Create Button_3
            app.Button_3 = uiradiobutton(app.Ratethisfrom1to5ButtonGroup);
            app.Button_3.Text = '3';
            app.Button_3.Position = [192 6 29 22];
            
            % Create Button_4
            app.Button_4 = uiradiobutton(app.Ratethisfrom1to5ButtonGroup);
            app.Button_4.Text = '4';
            app.Button_4.Position = [288 6 29 22];
            
            % Create Button_5
            app.Button_5 = uiradiobutton(app.Ratethisfrom1to5ButtonGroup);
            app.Button_5.Text = '5';
            app.Button_5.Position = [385 6 29 22];
            
            % Create PassorFailButtonGroup
            app.PassorFailButtonGroup = uibuttongroup(app.UIFigure);
            app.PassorFailButtonGroup.TitlePosition = 'centertop';
            app.PassorFailButtonGroup.Title = 'Pass or Fail?';
            app.PassorFailButtonGroup.Position = [199 78 235 61];
            % Create PassButton
            app.PassButton = uitogglebutton(app.PassorFailButtonGroup);
            app.PassButton.Text = 'Pass';
            app.PassButton.Position = [11 8 100 22];
            app.PassButton.Value = true;
            % Create FailButton
            app.FailButton = uitogglebutton(app.PassorFailButtonGroup);
            app.FailButton.Text = 'Fail';
            app.FailButton.Position = [122 8 100 22];
            
            % Create Image
            app.Image = uiimage(app.UIFigure);
            app.Image.ImageClickedFcn = createCallbackFcn(app, @ImageClicked, true);
            app.Image.Position = [611 1 437 470];
            
            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end
    end
    
    % App creation and deletion
    methods (Access = public)
        
        % Construct app
        function app = TestApp
            
            % Create UIFigure and components
            createComponents(app)
            
            % Register the app with App Designer
            registerApp(app, app.UIFigure)
            
            if nargout == 0
                clear app
            end
        end
        
        % Code that executes before app deletion
        function delete(app)
            
            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end

Answer 1

[Simon Chan]

Use Writemode with append:

writematrix(value, 'feedback.txt', 'WriteMode','append')

Answer 2

[Rik]

If you want to write both values, you need to specify that, or append instead of overwriting.

%When user types into box, save into file memory
value = app.HowdidthisfunctionworkEditField.Value;
newvalue = app.DoyouhaveanycommentsorSuggestionsEditField.Value;
writematrix({value;newvalue}, 'feedback.txt', 'QuoteStrings',false);