In ESP32 For Busy People, I have a section on the SPIFFS, the SPI file system. In this section, I show you how you can upload a file (like an image, or a text file) to your ESP32 and then use it in your sketches.
One thing I did not show was how to retrieve a file from the SPIFFS. For example, you may have a sketch that logs sensor data to a text file. How can you retrieve that file so you can process it on your computer?
A straight-forward way to do this is to run a simple web server on your ESP32. Using a browser, you can use this web server to download any file in the SPIFFS.
It’s the FSBrowser sketch, under File –> Examples –> Webserver.
In this video, I show you how to retrieve a file from the ESP32 using this sketch.