Extract files with the same names in subfolders and save them into a new folder with a different name

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I have .png files with the same name stored in different folders. My goal is to rename and copy them into a new folder. The following code just saves the last image in the new folder. I am not able to figure out how to save PNG files with incremental values in name. I would appreciate any help. Thanks in advance.
myFolder = 'current folder path';
filePattern = fullfile(myFolder, '**/*.png');
theFiles = dir(filePattern);
numFiles = length(theFiles);
outputFolder = 'new folder path';
for K = 1 : numFiles
baseFileName = theFiles(K).name;
fullFileName = fullfile(theFiles(K).folder,baseFileName);
limages = imread(fullFileName);
fullFileName = fullfile(outputFolder, theFiles(K).name);
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Shourya 2022년 4월 15일
편집: Shourya 2022년 4월 15일
@Walter Roberson Thank you for your response. There are no such requirements. I just want to retrieve and store all the files in a single folder. A number before the file extension with underscore is also fine. My files in subfolders are named as output_img.png.

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per isakson
per isakson 2022년 4월 15일
myFolder = 'current folder path';
filePattern = fullfile(myFolder,'**','*.png');
theFiles = dir(filePattern);
numFiles = length(theFiles);
outputFolder = 'new folder path';
mkdir( outputFolder )
for K = 1 : numFiles
source_file = fullfile( theFiles(K).folder, theFiles(K).name );
target_name = sprintf( '%s_%03d.png', theFiles(K).name, K ); % less than 999 files
target_file = fullfile( outputFolder, target_name );
copyfile( source_file, target_file );
And some error handling and testing.
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