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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.
@Gordon
This exact thing got reported to the bug tracker just a week ago! https://github.com/espruino/BangleApps/issues/2073
Basically it seems the app loader in Gadgetbridge can't pop up a 'save file' dialog, so it'll need a tweak inside Gadgetbridge to make it work properly