Not sure if there is a better way currently but i use the web IDE ( https://www.espruino.com/ide/) to upload stuff. Third icon in middle gets you to the storage manager where you can convert and upload an image.
I've found that the "simple image viewer" says in it's description that it displays showimage.user.img but actually looks for showimg.user.img .
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Not sure if there is a better way currently but i use the web IDE ( https://www.espruino.com/ide/) to upload stuff. Third icon in middle gets you to the storage manager where you can convert and upload an image.
I've found that the "simple image viewer" says in it's description that it displays showimage.user.img but actually looks for showimg.user.img .