I would like to upload files/images to a certain folder structure of the Arduino. How can I do this?
Do I need a special tool/script to upload?
(I want to do this because I want to have HTML code with local images and CSS references)
The Arduino itself has no folder/file structure. Everything in memory is either code or data. You can add the ability to store data to an SD card if you want and this uses the standard folder/file structure.