Can anybody help me about deploytool for loading new data to gui interface ?

I design a gui interface and I want to use it with matlab compiler(deploytool). Data which is added previously is working correctly but when I want to add new data to gui , nothing is changing. I am not uploading new data. Only input_data matrix obtains in file also it is what I add. But I am not displaying it in gui surface. Can I add new data to programme? Following code is my loading code. Thank you in advance.

 if true

     function load_text_file_Callback(hObject, eventdata, handles)

[filename1,filepath1]=uigetfile({'*.txt*';'*.mat'});
length_fn=length(filename1);

st_pt=length_fn+1-4;
file_ext=filename1(st_pt:length_fn);

   file_ext == '.txt' % if the file is a text file

fid_airflow = fopen(fullfile(filepath1, filename1));

input_data= textscan(fid_airflow,'%d');

fclose(fid_airflow);

input_data = double(cell2mat(input_data)); % this does not

end

save ('input_data.mat','input_data')

load('input_data')

end