Save snapshot image to disk.

[ijg]

I'm aware this is an ID10T error, but after hours I can't figure out how to save the most recent camera snapshot to disk.
using last_image
I can echo it to the console, but am missing how to write it to a file.
I had assumed appending download_thumbnail may do the job, but I was wrong. Though this does work for last_video.

thank you for any help you can offer.