Puck.eval via in Web Bluetooth may work: https://www.espruino.com/Web+Bluetooth#reading-from-puck-js
But you'd need to be sure that each file you were reading was small enough that it could be loaded into RAM and 'stringified', or that method wouldn't work and you'd have to do it manually.
Another option is I'll be adding storage read/write functionality to the Web IDE soon so you'll be able to click 'download' through there...
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