PNG file saving in power point presentation

clear
clc


%removed the clear all, close all, clc, as they are irrelevant here and can only cause problems
project_dir = pwd();        %new
% List all current folder contents ending with .png. Resulting names will
% appear in the order returned by the operating system.
files = dir( fullfile(project_dir, '*.png'));    %changed
% Create Common Object Model (COM) server so MATLAB can export data to
% PowerPoint
g = actxserver('powerpoint.application');
% Open PowerPoint and make it visible
g.Visible = 1;
Presentation = g.Presentation;
% Prompt the user for the PowerPoint file to amend
[fn, pn] = uigetfile('*.pptx', 'Select PowerPoint File To Amend');
filename = fullfile(pn, fn);                                %changed
Presentation = invoke(Presentation, 'open', filename);
% Get current number of slides
slide_count = get(Presentation.Slides, 'Count');
% Export all PNGs in the current directory to the PowerPoint file specified
% above. The following slides will be added to the END of the PowerPoint
% file. All slides will have a common title.
for i=1:length(files)
        slide_count = int32(double(slide_count)+1);
        slide = invoke(Presentation.Slides, 'Add', slide_count{i}, 11);
        set(slide.Shapes.Title.Textframe.Textrange, 'Text', 'SomeTitle');
        slidefile = fullfile(project_dir, files(i).name);      %new
        Image{i} = slide.Shapes.AddPicture(slidefile, 'msoFalse', 'msoTrue', 0, 80, 720, 440);      %changed
end
% Save the amended PowerPoint presentation to the current directory
outfile = fullfile(project_dir, 'DRAFT.pptx');       %new
Presentation.SaveAs(outfile);                        %changed
% Close PowerPoint as a COM automation server
g.Quit;
g.delete;

If i have 4 PNG images in a folder , how can i save (present) those in a single slide in power point using MATLAB code? I am using the code below but showing some error.