Just to let you know I've been adding a menu to allow you to list files in Espruino's storage, view, download and upload them.
Should work with Bluetooth and Serial.
You can try it out on the GitHub-hosted Web IDE (it's not live on the proper one yet):
Just click the star in the bottom-middle of the window. If you don't get one, try a hard-reload, and if you've used the GitHub IDE before and it's not working now, try going into
chrome devtools -> application -> unregister service worker and try another hard reload.
I'd be interested to see what you think. Hopefully image converter tools will come soon.