One of the key design objectives of the StartMeStick is that it never changes your computer.
You may see*, but not modify or delete, the files on your computer. You may copy your files to an external drive plugged in after the StartMeStick has started. The files on your external drive will be technically editable but the StartMeStick doesn't contain the types of programs (e.g. Microsoft Word, Excel) used to edit these types of files. However, the StartMeStick is a system for using the Internet, and you can upload these files to the cloud and edit them there.
*Note: Mac, Optane, and RAID systems as well as systems encrypted with Bitlocker are not supported at this time, meaning you cannot see the files on these systems.