This may be due to the path used to access the file in your code.
In deployed environments, the simplest way to obtain the full path to a file is using the which function:
if isdeployed
file_path = which('test_data.xlsx');
end
Alternatively, you can construct the full file path using ctfroot:
if isdeployed
file_path = fullfile(ctfroot,'folderA','test_data.xlsx');
end
For more information on both these options, see Include and Access Files in Packaged Applications.
