You can use API to write the data: https://www.mathworks.com/help/matlab/ref/webwrite.html, but that can get complicated for AWS S3.
The easiest solution might be just to use the system() function: https://www.mathworks.com/help/matlab/ref/system.html. You can just run the shell command from MATLAB
system('aws s3 cp local_path cloud_path')
However, note that it does not use the same $PATH variable as your default shell. You will need to use setenv() to add another directory to $PATH variable, or you will need to specify the complete path to aws binary, for example
system('/usr/local/bin/aws s3 cp local_path cloud_path')
There seem to be some options for uploading the file using MATLAB too: https://www.mathworks.com/help/matlab/import_export/work-with-remote-data.html
