How can I import multiple .csv files that are in separate folders

I am trying to import a large set of data and the problem I am running into is that they are stored in multiple folders inside a Main folder. I have changed my directory to this Main folder but it won't let me loop through the .csv files in the Main folder as they each are in their separate folder. Unfortunately, this is how the data is output by our data collection machines so is there a way I can potentially write a code that opens each folder and extracts the file information? I appreciate the help

Edit: I also do not have any sample code as this is the first step in my process

Answer 1

[Meade]

Try this:

!!Careful, this will find ALL csvs in a folder!! You can further narrow down, e.g. by filename, using additional logical indices

 mainFolder = uigetdir();    % Selectyour Main folder 
 [~,message,~] = fileattrib([mainFolder,'\*']);
 fprintf('\n There are %i total files & folders.\n',numel(message));

 allExts = cellfun(@(s) s(end-2:end), {message.Name},'uni',0); % Get exts
 CSVidx = ismember(allExts,'csv');    % Search ext for "CSV" at the end 

 CSV_filepaths = {message(CSVidx).Name};  % Use CSVidx to list all paths.
 fprintf('There are %i files with *.CSV exts.\n',numel(CSV_filepaths));

 for ii = 1:numel(CSV_filepaths)
    % Do import here
 end

Answer 2

[Image Analyst]

See attached demos, one for releases prior to R2016b and one for R2016b and later.