xls read multiple files into one script; Only reading last file

I am trying to add multiple .xls files into Matlab and plot some data against time. The first file contains data for one hour of time, the second file contains data for the second hour of time and so on. I want each file to build off of the previous file. Each file contains the same column headers in the first row. When I read multiple files into the script, it only loads the last file I select.

[file_list,path_n] = uigetfile('.xlsx','Grab the files you want','Multiselect','on');
if iscell(file_list) == 0
    file_list = [file_list];
end

for i = 1:length(file_list)
    filename = file_list{i};
    data_in = xlsread([path_n filename]);
    alldata = data_in(:,:); 
end

Time = alldata(:,2);
Position_Rev = alldata(:,3);
Current = alldata(:,8);
Voltage = alldata(:,9);
Altitude = alldata(:,162);
Motor_Speed = alldata(:,4);

date_time = datetime(Time,'ConvertFrom','epochtime','TicksPerSecond',1e3,'Format','dd-MMM-yyyy HH:mm:ss.SSS');

figure(1)
yyaxis left
plot(date_time,Motor_Speed)
xlabel('Time','FontWeight','bold','Fontsize',12);
ylabel('Motor Speed','FontWeight','bold','Fontsize',12);
hold on
yyaxis right
plot(date_time,Current)
ylabel('Current','FontWeight','bold','Fontsize',12);
title('Time vs. Motor Speed','FontWeight','bold','Fontsize',12);

Answer 1

[Image Analyst]

You're overwriting alldata each time. You probably want to append onto it. Instead of

alldata = data_in(:,:); % Overwrite alldata with data_in.

do

alldata = [alldata; data_in];    % Append data_in to alldata.

Be sure to initialize alldata before the loop

alldata = [];

[notalwayssure]

Thanks for the help! One more question, how do I get my script to bypass the first row in each excel file? My script is initially plotting a data point at each minute (0 min-59min) and then starting over from 0 min instead of continuing from 60-119min.